still wont start

[cf1]

put new sender unit fuel pump, set # 1 tdc and rotor to # 1 in the cap. backfierd thu the tbi, took oil filer cap off and smoke came out. could it be egr? or could i have distributor out?

[S10 Kevin]

Was the distributor out? If so, when you aligned the rotor to #1 and with the engine at TDC, did you verify the engine was on the compression stroke? It sounds like your distributor maybe off 180 degrees. If the distributor was just reinstalled and you didn't make sure it was on compression stroke, there's a good chance you can solve your problem by getting the engine back to TDC with the rotor rotated 180 from #1. Then pull the distributor and reinstall it pointing at #1. Better still check to make sure it's on TDC compression stroke when the rotor is at #1. I'm not sure how to check whether it's on exaust or compression stroke other than by pulling a valve cover and looking at the valves, maybe somebody here knows another way.

Good luck.

[rlith]

Also when being timed, the ECM has to be disconnected from the distributor..Firing order is 165432

[Fireplug]

Sounds like your 180 out also do you have the cross fire cap ?? if so make sure your on number 1

[cf1]

Originally Posted by Fireplug

Sounds like your 180 out also do you have the cross fire cap ?? if so make sure your on number 1

i tryed to start it and it blew the corners of the valve covers up an inch. so i removed the valve covers and there is no carbon of any kind.the man at the parts store said it must be carboned up prety bad for it to back fire. this truck was runing excelent no pings or knocks, or misses. it just satarted runing out of gas. i put 5 galons in it to be sure i had gas and when i tryed to start it it back fired thru the exhust,and black smok and kept backfireing . i replaced entire dist, coil wires cap timing chain. i need to time it with a lite but i cant find the wire to unhook. this is a tbi couldnt i just remove the 2 plugs from the dist.could the tbi be geting to much fuel how would i check. it. the egr seems to be working. what else could it be. thanks

[blazee]

It would have been helpful to keep all this in one thread:

http://www.automotiveforums.com/vbul...d.php?t=401806

http://www.automotiveforums.com/vbul...d.php?t=405918

[Fireplug]

Carbon cause a backfire no
Backing fireing is caused by the wrong ign timing or a very lean fuel problem, worn cam ,broken valve spring just to name a few things.
If this problem just started out of the blue and you had al ready replaced the timing chain recheck that you are on number 1 cylinder compression stroke at top dead center and pull the dist cap and see where the rotor is pointing.

[cf1]

Originally Posted by Fireplug

Carbon cause a backfire no
Backing fireing is caused by the wrong ign timing or a very lean fuel problem, worn cam ,broken valve spring just to name a few things.
If this problem just started out of the blue and you had al ready replaced the timing chain recheck that you are on number 1 cylinder compression stroke at top dead center and pull the dist cap and see where the rotor is pointing.

fireplug do you think my engine is junk because of all the backfireing?I have the #1 piston on tdc... I try and line the rotor with # 1 in the cap. on that plug wire in the cap is going to # 1 spark plug.. i think if anything i am not geting the distriburtor i right .. i have # 1 wire in the cap from the hold down screw in the cap its the 3 rd terminal. i have rotor pointing to this terminal.then in a clock wise motion #6 ,#5#4,#3#2. when i start it it backfies and the tbi caches a fire.. could it be in the tbi.. i would like to time it with a light i do have a timing light, but i cant find the so called wire from the computor to unhook.. the man at the parts store said the timing for this truck is on the radiator shroud. i dont see nothing..... what i need to know is hou to hook this timing light up and where the wire is i unplug.. and what the timing sets on this engine... thanks..

[Fireplug]

Recheck your firing order, how did to align the dots on the cam and carnk sprockets, do you have a manual if so does it show where to put the marks.
What engine do you have?? does it run at all if it does run then slowly turn the dist (with the engine running) and see if the rpms pick up . try both ways untill you find the spot where the engine idles best.

[Fireplug]

Recheck your firing order, how did to align the dots on the cam and carnk sprockets, do you have a manual if so does it show where to put the marks.
What engine do you have?? does it run at all if it does run then slowly turn the dist (with the engine running) and see if the rpms pick up . try both ways untill you find the spot where the engine idles best.

[jackass#1]

yeah, the firing order he read off from his cap doesnt sound right. they do not go in that order. if you had a 2.8 that would be right but your #1 would be at 7oclock position.

[rlith]

Originally Posted by cf1

fireplug do you think my engine is junk because of all the backfireing?I have the #1 piston on tdc... I try and line the rotor with # 1 in the cap. on that plug wire in the cap is going to # 1 spark plug.. i think if anything i am not geting the distriburtor i right .. i have # 1 wire in the cap from the hold down screw in the cap its the 3 rd terminal. i have rotor pointing to this terminal.then in a clock wise motion #6 ,#5#4,#3#2. when i start it it backfies and the tbi caches a fire.. could it be in the tbi.. i would like to time it with a light i do have a timing light, but i cant find the so called wire from the computor to unhook.. the man at the parts store said the timing for this truck is on the radiator shroud. i dont see nothing..... what i need to know is hou to hook this timing light up and where the wire is i unplug.. and what the timing sets on this engine... thanks..

You #1 plug on the cap is at the 5 o'clock position. the rest will be 65432 clockwise. That said, the ecm disconnect wire is behind the passenger side carpet coming out of the firewall grommet. It's a tan wire with a spade connector. Disconnect it before timing it. When setting TDC make sure you are on the COMPRESSION stroke, NOT the exaust stroke.. For the timing light, clamp the #1 wire and ground the ground wire at the bat, shine it against the timing mark on the timing chain cover.

[jackass#1]

you have a 93 4.3, so the firing order is 1,6,5,4,3,2 with #1 at 5oclock position. cylinder # front to rear, drivers side are 1,3,5. pass. side is 2,4,6.firing clock wise on distributor, #1 at 5oclock position than 6 then 5 then 4 then 3 then 2 then all should be well there. then make sure #1 piston is all the way up, when it is take cap off( leave plug wires attacched) make sure rotor is pointing to #1 or at 5oclockposition. then youre good there. use the manual to the timing light to use it. the wire youre looking for is in the cap behind or under glove box, it is brown. no you cant just unhook both connectors from distributor. time the truck. and if it still doesnt start please dont start a new thread about it.

[blazee]

He has a half ton pick-up. Will the timing wire be in the same place?

[cf1]

Originally Posted by blazee

He has a half ton pick-up. Will the timing wire be in the same place?

jackass was right i had the rotor pointing at the 7 oclock position... heres what i did.. took # 1 spark plug out turned the engine untill i felt air expell from hole.. put a pencile in the hole and felt that piston was up . was up.. put distributor in and looking at distributor from the front of engine put rotor at 5 oclock.. put cap on with # 1 wire in line with the rotor.. turned engine a few times and double checked.. in a clockwise motion looking at the dist. put#6 wire next to # 1 wire then wire 5,432... now on the engine from left bank 246wires.. right bank drivers side 135.. iremoved the carpet and there was no wire, i do see a big harness of wire up behind the glove box, i will remove the glove box later.. after i take a brake and eat i will try and start the truck.. i do have a chilton manual, but it dont say where the wire is.. i do have a timing light and i know how to use it. i have worked on 318 and 305 engins way back but all this computor and emision stuff confuses me. if i cant get it runing this time i will leave it set,untill i get money to tow it into town and pay a mechanic.. thanks all you guys for your help.. ken