truck wont start

cf1 · #1 04-28-2005, 12:23 PM

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?

OverBoardProject · #2 04-28-2005, 03:54 PM

Change your fuel filter, and then check the fuel pressure

BlazerLT · #3 04-29-2005, 02:14 AM

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.

cf1 · #4 04-29-2005, 07:19 PM

Quote:

Originally Posted by BlazerLT

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...

BlazerLT · #5 04-29-2005, 10:28 PM

Please do what I told you to do.

I am telling you what could be wrong.

cf1 · #6 04-30-2005, 06:06 PM

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 · #7 04-30-2005, 07:47 PM

Quote:

Originally Posted by cf1

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.

cf1 · #8 05-01-2005, 11:19 AM

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

blazee · #9 05-01-2005, 11:37 AM

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 · #10 05-01-2005, 01:05 PM

Quote:

Originally Posted by cf1

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?

cf1 · #11 05-01-2005, 02:14 PM

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

cf1 · #12 05-01-2005, 02:22 PM

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 · #13 05-01-2005, 03:18 PM

Quote:

Originally Posted by cf1

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/vbul...d.php?t=401590

cf1 · #14 05-01-2005, 05:57 PM

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

cf1 · #15 05-04-2005, 12:38 PM

Quote:

Originally Posted by cf1

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.

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