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2001 4x4 s10 no spark


boss429
11-06-2007, 11:13 PM
hi i have a 2001 s10 4x4 4.3l vin code w with the edi ignition . my problem is that the other day i replaced my fuel preasure regulator and when i put the truck back together everything was fine truck started and ran just stumbled some due to high fuel preasure from a clogged return line. but when i pushed on the gas instead of it misfireing and stumbleing like it has for a few days now it misfire and stumble the stalled . cranked it over and nothing no start check for fuel and i have plenty but i have no spark i have good spark off the coil into the distributor but no spark comeing out of the distributor cap. i checked the timing and thats fine i can't figure out how i can have spark going in but not coming out any help or ideas would be great before i have to tow it to the dealer and have then work on it for 100$ and hour. i figured maybe my coil was bad so i put a new one on and still no spark it put the same amout of spark out as the old on so i returned it and put the old one back on. i am thinking maybe a pickup coil under the distributor cap but i don't want to go buy a part and that not be it.. any help would be great thanks

blazes9395
11-06-2007, 11:35 PM
If your getting spark from the coil and its a strong spark, then take a look under the distibutor cap and see if the rotor is damaged. In this case, if the cap and rotor are old, it may be a good idea to just replace them and go from there. Also if your letting the coil just ground out on itself when your checking for spark, you run a risk of damaging the coil itself, of more importantly, as its expense, you also run the risk of damaging the ignition module thats located right beside the coil. So be careful with that.

boss429
11-07-2007, 12:46 AM
the truck had a full tune up about 1 month ago cap rotor and all and i checked the cap and rotor they are fine any other ideas

MT-2500
11-07-2007, 09:07 AM
the truck had a full tune up about 1 month ago cap rotor and all and i checked the cap and rotor they are fine any other ideas

Boss429
Proper testing.
Do not go by what has been done.
Parts can go bad.
Check for what is wrong now.

As in your other post ckeck coil for putting out good hot blue spark with a spark tester not your timing light.
Then test coil wire to dist for good hot blue spark.

If the coil and coil wire is putting good hot spark into dist and spark is not coming out and dist is turning when engine is cranking.

You have a bad dist cap or rotor.
Remove them and have a look at them.
You will find something there.
It is common for rotor to short out to dist cap with cheap aftermarket parts.
Look under and on top of rotor for a pin hole or carbon tracking.
Then look on underside of dist cap for carbon tracking or shorting across.
Replace cap and rotor with AC delco brand.
Did the problem start when last tuned up or right after it?
Was a AC delco cap and rotor used with tune up?

boss429
11-07-2007, 11:28 AM
no the problem started when i put a new fuel preasure regulator on the engine the truck still ran like crap after words but this time it stalled and won't start and yes the cap and rotor where ac delco.i had the dealer put them on. there are no cracks carbon spots shorts or anything else on the cap or rotor 3 auto parts stores said the cap and rotor are still good and the dealer said they would not do a parts warrenty on a good part.they believe its a sensor but will not say what it is without looking at it which cost 100$ and hour and the cost to tow it out there..

MT-2500
11-07-2007, 11:54 AM
no the problem started when i put a new fuel preasure regulator on the engine the truck still ran like crap after words but this time it stalled and won't start and yes the cap and rotor where ac delco.i had the dealer put them on. there are no cracks carbon spots shorts or anything else on the cap or rotor 3 auto parts stores said the cap and rotor are still good and the dealer said they would not do a parts warrenty on a good part.they believe its a sensor but will not say what it is without looking at it which cost 100$ and hour and the cost to tow it out there..


Ok have you rechecked and double checked for good hot blue spark from coil and threw coil wire?
And for dist turning all of the time?

Crank engine for a minute and make sure it keeps firing good.
I have saw a bad coil or coil wire that will spark a time or two and then quit.

How far does the spark jump on a spark tester?

Is the dist turning good and is the rotor pointing to no one plug wire TDC compression stroke?
or the stamped 6 on dist housing TDC compression?
http://files.automotiveforums.com/gallery/showphoto.php?photo=51302
Like in this picture?http://files.automotiveforums.com/gallery/showphoto.php?photo=51302

boss429
11-07-2007, 03:07 PM
welli decided to go back out and check the spark for a 3rd time and this time the coil was putting out almost no spark. i figured before i go waste a crap load of money on more parts that my mechanic said it could be i would go to the junk yard and grab some stuff for cheap i got 2 good caps and rotors a ignition control modulefor 5 bucks so i put on cap and rotor on and the truck started for a second then stalled so i tryed it again and it started ran a second i push on the gas and stalled so i check the coil for spark with a spark plug and a spark tester both had very little spark after a few cranks first 5 or 6 cranks its strong the dies out and the engine kinda puffs like a small backfire is that a coil or control module casueing the weak spark

old_master
11-07-2007, 03:34 PM
Why did you replace the fuel pressure regulator?

boss429
11-07-2007, 04:27 PM
i replaced the fuel preasure regulator becuase my truck was stumbleing and running rich becuase i have 80psi at my shracder vavle so i replaced the regulator and i still have 80 psi i checked for clogged lines and didn't have any but my big problem is the non starting thing. i have some spark plugs getting spark after i crank the engine over some and some don't i have a new cap and rotor on the truck now and i am still getting the same crappy spark no spark is it the pickup coil under the distributor cap or the ignition coil going bad i need to find out soon can't have the truck sitting in the yard much longer..

old_master
11-07-2007, 04:36 PM
80psi at the test port indicates a restricted return line, PERIOD. Anything over 75psi will damage the fuel pressure regulator and allow pressure to build to whatever it takes to get through the restriction. The restriction is what caused the original regulator to fail. After replacing the regulator, and energizing the fuel pump, the new regulator was more than likely damaged also. Figure out what's causing the restriction and repair it. Then check fuel pressure again and make sure it regulates at no more than 66psi.

MT-2500
11-07-2007, 05:06 PM
welli decided to go back out and check the spark for a 3rd time and this time the coil was putting out almost no spark. i figured before i go waste a crap load of money on more parts that my mechanic said it could be i would go to the junk yard and grab some stuff for cheap i got 2 good caps and rotors a ignition control modulefor 5 bucks so i put on cap and rotor on and the truck started for a second then stalled so i tryed it again and it started ran a second i push on the gas and stalled so i check the coil for spark with a spark plug and a spark tester both had very little spark after a few cranks first 5 or 6 cranks its strong the dies out and the engine kinda puffs like a small backfire is that a coil or control module casueing the weak spark

With out proper testing and test equipment it is a tough call.
Does you auto parts place have a coil or module tester.
And do not rule out the coil wire untill you have checked it.
And the wiring plug on the coil.
Do you have good ign voltage to coil?
In your lower post there was a wiring problem on the back of horn relay.
Did you get that fixed good or was the wires just shorted or burnt?
When it was in the wreck was there any other signs of wire damage anyplace.
Check all power feeds and grounds.
Are you testing for spark direct at coil or on the end of coil wire?
But if you are throwing parts at it.
I would try a know good coil first thing.
Good Luck
MT

MT-2500
11-07-2007, 05:18 PM
Why did you replace the fuel pressure regulator?

Old Master
There is some more info in his lower post.
http://www.automotiveforums.com/vbulletin/showthread.php?t=761761

old_master
11-07-2007, 06:52 PM
Old Master
There is some more info in his lower post.
http://www.automotiveforums.com/vbulletin/showthread.php?t=761761

MT,
Sounds like a challenge to me. The fact still remains that fuel pressure is 80psi. A restriction after the fuel pressure service port is the ONLY thing that can cause that. Could be in the line assembly to the injector, (after the service port) the line from the regulator, the return line to the pump, or the tube in the fuel pump module that goes into the fuel pump motor well. Although it's doubtful the tube in the module is restricted, (due the pump being replaced), it is possible that something moved through the return line and became lodged there.

boss429
11-07-2007, 07:23 PM
ok i have now went out and bought a new coil and pickup coil and a ignition control module as well put them all on truck started the stalled as soon as i gave it some gas and now will not start again .. the truck ran for a hour or so after the fuel preasure regulator was replaced. then i went to start the truck to test drive it and as soon as i gave it gas it stumbled and stalled and would not start with now spark to the plugs so from what i am seeing i have a brand new cap, rotor, pick up coil ,ignition coil and control module and yet i still get the same results as what i did with all my old parts on which means either they all went bad or they werent bad and something else is my problem.. the horn is fixed and was fixed long before this happened the pump was not replaced i just put a new fuel assembly on the old pump do to the old assembly eing bent and causeing me fuel level sensor to read wrong and i never had a problem with the truck tell i messed with the bent fuel assembly.. o and as for the wonderful obd2 system that is suposed to tell you whats wrong i can't even get it to give me a bad code and i know the system works becuase chevy scaned my airbags and engine before i put the truck on the road.. have to say i love my s10 not for a truck that is so new its sure acts like crap id perfer a old carb engine any day

old_master
11-07-2007, 07:30 PM
Keep in mind, the OBD system does not directly monitor the fuel system or the ignition system and cannot set a DTC if there is a problem with either.

boss429
11-08-2007, 12:51 AM
ok then if odb2 can't trouble shoot the ignition system then how do you trouble shoot it

blazes9395
11-08-2007, 10:41 AM
I am having trouble with this. Is your fuel pressure still at 80 psi?

boss429
11-08-2007, 03:09 PM
yes the fuel is still at 80 psi i have now checked for a kinked line nothing i ran a wire through the return line no clog anywhere and i have now put another new fuel preasure regulator on it and i still have 80 psi but my big problem is i can't get the damn truck to start becuase i have no spark coming out of the dist cap and so far everything on my ignition is brand new now cap rotor pickup coil ignition coil control module and the truck still only starts now and then but die when i give it gas then won't start for about 8 hour again and does the same thing my timeing in the ening eis fine i check it and its all right but i can't figure out i have hot blue spark going into that cap and none coming out and when it does some out it only does it on like 1 or 2 plugs and then every so often i will get lucky and it start and stumbles a bit so i try the gas pedal and it stall then just cranks with no spark again im not really worried about the fuel system that is going to be taken in to get check by chevy once the truck is running.becuase on not paying them 100$ to open the hood and 5 minutes later say you have this dumb little sensor bad and then charge me to fix the fuel system after the truck starts i want it to start before it goes to them... any ideas would be great

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