truck wont start

93 chevy 4.3 full size pick up. truck stated missing and black smoke like running out of gas. relaced oxengen sensor, map, coil, cap, wires. everything inside dist. cap. truck trys to state but spews gas thru thoutle body. i get spark at # 1. could it jumed time?. how do i check timing. or could it be another sensor like the egr?

Change your fuel filter, and then check the fuel pressure

Please use the search feature.

You might have a blown CPI injector and nut kit.

Do a search for them.

Also, do a search for EGR valve.

Please use the search feature.

You might have a blown CPI injector and nut kit.

Do a search for them.

Also, do a search for EGR valve.
its geting spark on #1 plug and plenty of gas. could it be it jumped time...

Please do what I told you to do.

I am telling you what could be wrong.

blazerlt.. thanks for the help. i dried the plugs changeg the oil and put a new pick up coil in.. the engin back fires thru the exhaust, and trys to start. my son has a 91 4,3 and the spray of gas at the thotle body sprays the same. i dont think its in the cpi.. the engine flooded before because it was not geting the right spark. now when i try to start it it does not flood. could the timing change jumped .itook the dist out turned the engine up piston on #1, trys to start buck backfires thru exhaust..should i replace the chain??thanks

blazerlt.. thanks for the help. i dried the plugs changeg the oil and put a new pick up coil in.. the engin back fires thru the exhaust, and trys to start. my son has a 91 4,3 and the spray of gas at the thotle body sprays the same. i dont think its in the cpi.. the engine flooded before because it was not geting the right spark. now when i try to start it it does not flood. could the timing change jumped .itook the dist out turned the engine up piston on #1, trys to start buck backfires thru exhaust..should i replace the chain??thanks

Ok, why are you playing with the timing chain and the distributor when you think it is a the CPI injector failing?

You need to be a little more focused.

Check the CPI injector and the nut kit.

Check the EGR valve for carbon blocking it open.

blazerlt.. i had to remove the distribtor to replace the pick up coil, believe it or not i had to use a puller to get to the coil. the egr valve seems lose but i cant see any carbon blockage. as for the cpi it seems to me its working fine, not to much gas. again my son was driving the truck and he thought it run out of gas thats when i think when he put gas in the throtle body it flooded out. now it wants to startb but back fires thru the exhaust. he has a 91 4.3 and the thottle body works the same. i dont realy know anything about the cpi. i think its out of time or the timing chain jumped, there is play in the rotor when i turn the engine by hand. anotherthing my chilton book says when the dist was taken out align the painted marks there is no marks on the shaft or dist. maybe i got the dist off.. thanks

What is your engine code? (The eighth digit in the VIN number) You may not even have a CPI.

Sounds like you put the distributor in wrong. The painted marks that the Chilton book is talking about, are the ones that you were suppose to paint on before removing the distributor.

blazerlt.. i had to remove the distribtor to replace the pick up coil, believe it or not i had to use a puller to get to the coil. the egr valve seems lose but i cant see any carbon blockage. as for the cpi it seems to me its working fine, not to much gas. again my son was driving the truck and he thought it run out of gas thats when i think when he put gas in the throtle body it flooded out. now it wants to startb but back fires thru the exhaust. he has a 91 4.3 and the thottle body works the same. i dont realy know anything about the cpi. i think its out of time or the timing chain jumped, there is play in the rotor when i turn the engine by hand. anotherthing my chilton book says when the dist was taken out align the painted marks there is no marks on the shaft or dist. maybe i got the dist off.. thanks

How do you know it is fine?

Did you remove the top IMTV valve and look down in?

blazee.. the eighth didget is Z in the vin number.

blazerlt.. i dont know what the imtv is all i know the spray of gas in the tbi is the same as on my sons truck.it seems like it gets the right amonut of gas now but the spark is off. i need to get this dist back in the right way.i am retired and i live way out in the country and this is my only vehical. my son will be going home tonight to go to work, he lives 70 miles away. so if we cant get it going tonight i will pull the water pump and check the timing chain.thanks

blazee.. the eighth didget is Z in the vin number.

Don't worry about the CPI.....you don't have one. I would concentrate on the timing. There are instructions in this thread:

http://www.automotiveforums.com/vbulletin/showthread.php?t=401590

blazee.. thanks a lot thats a relief.. my son went back home, so i am begining to tear the water pump and get to the timing chain, tommorw i will hitch a ride to town and get a pump and timing chain with new gears,and also a egr valve and hope this old truck fies up. i just hope i got the distribter in right. by the way the chilton book refers to a knock sesor should i replace that to. thanks

blazee.. thanks a lot thats a relief.. my son went back home, so i am begining to tear the water pump and get to the timing chain, tommorw i will hitch a ride to town and get a pump and timing chain with new gears,and also a egr valve and hope this old truck fies up. i just hope i got the distribter in right. by the way the chilton book refers to a knock sesor should i replace that to. thanks
put a new timing chain and gears in, the old chain was streached but the marks on the gears was on the money. put everything back to geather put # 1 on tdc and rotor in dist pointing to # 1 in the cap. fires but wont stay runing. what could it be , it dont back fire thru the exhaust any more. it runs breifly.

put a new timing chain and gears in, the old chain was streached but the marks on the gears was on the money. put everything back to geather put # 1 on tdc and rotor in dist pointing to # 1 in the cap. fires but wont stay runing. what could it be , it dont back fire thru the exhaust any more. it runs breifly.

Did you check the CPI injector yet?

Did you check fuel pressure yet?

I believe that is what I told you in the first place to check and you ignored my advice.

Is your a CPI by the way? Does it have the vortec nameplate on top of the engine?

Did you check the CPI injector yet?

Did you check fuel pressure yet?

I believe that is what I told you in the first place to check and you ignored my advice.

Is your a CPI by the way? Does it have the vortec nameplate on top of the engine?

His is Z code throttle body.

ah, ok, I thought he was saying the Z was from his son's truck.

He needs to use a timing light and properly time the engine.

The timing chain was replaced for no reason.

The timing is off and a new timing chain will solve nothing.

Get a timing gun, remove the timing wire, set the timing to zero, reconnect the timing wire, reset the computer and go from there.

put a new timing chain and gears in, the old chain was streached but the marks on the gears was on the money. put everything back to geather put # 1 on tdc and rotor in dist pointing to # 1 in the cap. fires but wont stay runing. what could it be , it dont back fire thru the exhaust any more. it runs breifly.

Is your check engine light on?

If you are sure you have the timing right, now. It is time to start standard testing:

Check the fuel pressure.

Make sure you are getting spark.

the engine has a thottle body, i dont have cfi.. i am geting plenty of gas, the engine is on tdc. i think its in the distributor. my son didnt mark it when re removed it. i had to use a small puller to get to the pickup coil. the pick up coil came with no no no directions. it was so tight to get out i think it was original. i need a diagram of the intire contents of the dist. so i know everything in right, my chilton book dosnt show it.every engine i ever messed with when you put a new timing chain on and set the rotor to #1 and tdc. it fierd up. then i could turn the dist to time it to run and then put a light on it. i do got a timing lite but i need to keep it runing. i know its in the dist. my son wont be down for 2 weeks or i would use his,, any ideas??thanks i am geting spark on #1 plug,

the engine has a thottle body, i dont have cfi.. i am geting plenty of gas, the engine is on tdc. i think its in the distributor. my son didnt mark it when re removed it. i had to use a small puller to get to the pickup coil. the pick up coil came with no no no directions. it was so tight to get out i think it was original. i need a diagram of the intire contents of the dist. so i know everything in right, my chilton book dosnt show it.every engine i ever messed with when you put a new timing chain on and set the rotor to #1 and tdc. it fierd up. then i could turn the dist to time it to run and then put a light on it. i do got a timing lite but i need to keep it runing. i know its in the dist. my son wont be down for 2 weeks or i would use his,, any ideas??thanks i am geting spark on #1 plug,
bought a new distrbutor and hope i got it in right, put #1 on tdc and turned the engine over blew the pcv valve and oil filer cap off. took the plugs out all plugs was dry except 5 and 6 was soaked with gas .. could i have a stuck valve.??

ok, with the new distributor in and #1 at tdc, is the rotor pointing to #1 spot on cap? it needs to be!! if it is then yore ready to set timing. do you know how?

ok, with the new distributor in and #1 at tdc, is the rotor pointing to #1 spot on cap? it needs to be!! if it is then yore ready to set timing. do you know how?
the @1 is on tdc and the rotor is pointing to # 1 in the cap, # 1 in the cap is the 2nd post over from the hold down srew right with 1 marked inside of cap?? but when i tryed to start it it blew the pcv out and the oil cap out. i need to get it runing.so i can time it.this truck run perfect before the check engine lite came on the went out a few days before. then one day i got in it it started loping and missing and the check ingine lite came on and stayed on, so i had my son drive it down to auto zone to get the lite checked, it started missing and stoped runing like it was out of gas, we put 10 galons of gas in it and it would not start so we pulled it home. when i got home there was gas all over the exhaust, i dryed it out and seen if it would start and it was backfireing thru the exhust and never started again. could it be a stuck valve?>? i have new timing chain, gears, distibutor coil, plug wires cap, could it be the fuel pump geting to much gas?? the injectors in the tbi is spraying gas ok..

I don't know about Chevy, but I had a Ford 1/2 ton that acted that way when my electronic ignition brain packed it in.

It's a comon problem with Fords, and I know several people that pack a spare modual with them because of the problem, so it was easy to find

I don't know about Chevy, but I had a Ford 1/2 ton that acted that way when my electronic ignition brain packed it in.

It's a comon problem with Fords, and I know several people that pack a spare modual with them because of the problem, so it was easy to find
Are you talking about the main computor? i think if that went out i wouldnt get spark>> i just bought a fuel pump and will install it tomorrow. mabe its not geting right pressure, i dont have tester and auto zone wants $40.00 to buy one..whats the easy way to do it drop the tank or remove the bed. this is full size..

if you think its getting too much fuel it would be a bad pressure regulator not the pump. the regulator is to keep 9 to 14 psi and what ever is exess gets returned to tank via return line. and you can still time it just by cranking it doesnt have to start to time it. if its blowing tops off things that is what it is. you need to unhook spark advance wire fron pcm than with a timing light and a loose distributor, line up the mark(one on crankcase wheel and the timing marks that are marked 8 6 4 2 0) 0 is what the mark on wheel needs to line up with. and then tighten distr. down and rerconnect browm wire to pcm. now timing is set. it needed to be done anytime you mess with the distrbutor. as far as fuel change out the regulator.

if you think its getting too much fuel it would be a bad pressure regulator not the pump. the regulator is to keep 9 to 14 psi and what ever is exess gets returned to tank via return line. and you can still time it just by cranking it doesnt have to start to time it. if its blowing tops off things that is what it is. you need to unhook spark advance wire fron pcm than with a timing light and a loose distributor, line up the mark(one on crankcase wheel and the timing marks that are marked 8 6 4 2 0) 0 is what the mark on wheel needs to line up with. and then tighten distr. down and rerconnect browm wire to pcm. now timing is set. it needed to be done anytime you mess with the distrbutor. as far as fuel change out the regulator.
bought a pump and will install it today dont know where the regulator is on this. i was pulling tree stumps 2 weeks ago mabe something broke lose from the pump.. cant i just hook my timing lite to the battery and to # 1 plug and time it.? i cant seem to find that brown stripe wire. the computor is on the drivers side wheel well. thanks

if you dont unhook this wire you will not get correct readings. well yeah you have to use a light.

Are you talking about the main computor? i think if that went out i wouldnt get spark>> i just bought a fuel pump and will install it tomorrow. mabe its not geting right pressure, i dont have tester and auto zone wants $40.00 to buy one..whats the easy way to do it drop the tank or remove the bed. this is full size..

There's an ignition modual on the distributer (I believe), and aparantly they aren't that reliable on Chevy's either. It's kinda ( shaped and about 2.5" long and 1" wide.
My mechanic friend had to replace 1 today, and told me that I should carry a spare with me when tracking on the back roads.
My distributer is the older electronic ignition and I never saw him install it, so I can't tell you where it is located

I still had spark with my old Ford, enough spark to cause it to backfire when it packed it in.

When you start replacing expensive parts that were working fine it's almost time to take it to a shop for a quick check up.
We can try helping you, but it's pretty tough to diognose some problems on the net.
I just don't want to see you blow all your coin on unnessary parts

if you dont unhook this wire you will not get correct readings. well yeah you have to use a light.
thanks for all the help i puled the tank off and the plug that gos into the sending unit was half out, the clip that holds it was gone. the flote was at the end of the tank and was pulled lose from the sender. the only place i can get one to day is three counties away the parts man ordered it and said i could pick it up today after 330pm so it will take the bigest part of the day to get there, if i have time i will put it in tonite ..then i will put it on tdc and put the rotor on # 1 in the cap and hope it cranks up..as for the wire i cant find the wire to time it, i do have a timing lite.

There's an ignition modual on the distributer (I believe), and aparantly they aren't that reliable on Chevy's either. It's kinda ( shaped and about 2.5" long and 1" wide.
My mechanic friend had to replace 1 today, and told me that I should carry a spare with me when tracking on the back roads.
My distributer is the older electronic ignition and I never saw him install it, so I can't tell you where it is located

I still had spark with my old Ford, enough spark to cause it to backfire when it packed it in.

When you start replacing expensive parts that were working fine it's almost time to take it to a shop for a quick check up.
We can try helping you, but it's pretty tough to diognose some problems on the net.
I just don't want to see you blow all your coin on unnessary parts
well i relaced the module and pickup coil and coil and map sensor and wires and cap, and pvc valve and infact the whole new distributor and timing chain and gears. i am on a fixed income and all this money is probly still cheaper than a tow and mechanics wages, i just have to do with out somethings till i get caught up on money, but i live out in the country and i need transportation i usly have to hitch a ride. ill get it going...thanks for the help..just put seding unit and fuel pump on ,# 1 on tdc and rotor pointing to # 1 in dist cap. backfired thru tbi, could it be egr valve?