TBI on a v6 gm van sputtering out at idle and on acceleration - Hot Rod Forum : Hotrodders Bulletin Board
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Old 12-25-2003, 09:44 PM
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TBI on a v6 gm van sputtering out at idle and on acceleration

What would cause this? IT only does it sometimes... the IAC and MAP senseor have both been replaced.

OH the other thing is it only does this when it is warmed up and it floods out so you cannot start it again.

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Last edited by stonedchihuahua; 12-25-2003 at 09:44 PM.
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Old 12-25-2003, 10:01 PM
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What's up Stoney?

I would check the O-rings on the injectors, sometimes they leak letting fuel bypass the injector. You can usually do a quick check by having someone turn the key to the "run" position while watching for fuel to dribble/squirt from the injectors. A very quick spirt is okay, but if it does it for more than a split second, you probably have a bad O-ring.
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Old 12-26-2003, 01:13 AM
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hey thanks alot man....

haha not my van, but I tell the buddys I will help em out cuz I got the most mechanical skill and if I dunno I can always ask around.

Lets hope it works
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Old 12-27-2003, 04:07 AM
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Ok I'm thinking this may be a fuel pump or injector problem as the injectors are not spraying anything when it doesn't start.
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Old 12-27-2003, 04:23 AM
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If you have spark! and no fuel pressure, Sounds like the fuel pump , when it quits and you have no fuel to the injectors have someone hit the gas tank in the center bottom while cranking with a hammer, if it starts right up replace the in-tank pump. And check the oil pressure sender next to the distributer this will shut the pump off if bad also.

Last edited by roys63; 12-27-2003 at 04:35 AM.
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Old 12-27-2003, 12:02 PM
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Re: TBI on a v6 gm van sputtering out at idle and on acceleration

Quote:
Originally posted by stonedchihuahua
OH the other thing is it only does this when it is warmed up and it floods out so you cannot start it again.
Are you sure it's flooding out or is your friend just assuming that cause it won't restart? If it isn't flooded but just not starting it could be like Roy said and be a fuel pump on it's way out (assuming you have spark). Believe it or not I have actually seen fuel filters so bad that they've caused vehicles to die completely. The GM TBI system usually runs on a much lower fuel pressure than the multi-port systems. If you think it might be a pump problem next time she stalls squirt a little carb cleaner down the throttle body and see if she kicks. You didn't mention any 'check engine light' so I'll assume it isn't lit.

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Old 12-27-2003, 12:40 PM
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NO check engine light.... carb cleaner does nothing....

yeah thats the other one we thought is maybe the fuel filter...
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Old 12-27-2003, 12:44 PM
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Have you been able to confirm spark when she dies? If you had spark and was just missing fuel she should have fired up briefly on carb cleaner.


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Old 12-27-2003, 01:28 PM
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There is spark. This is a fueling problem....

The buddy who owns the van has been looking into it also. He is going to be checking the fuel pump and filter.

Thanks for the help I will let you know what happens in case anyone else has the same prob.
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Old 12-27-2003, 06:32 PM
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Ok here is the prob.... injectors aren't squirting and we tested for power and there is no power going to them
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Old 12-27-2003, 07:04 PM
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Quote:
Originally posted by stonedchihuahua
Ok here is the prob.... injectors aren't squirting and we tested for power and there is no power going to them
You said it starts then dies right. It must have power??? You should see one wire with constant hot when the key is on and the other wire being ground and going back to the ECU. Generally there is a relay that pulls in to enable hot on the injector circuit when you turn the key on. Might check that relay if you can identify it. I am not familiar with the system, but seems to me there has to be power if it is starting at all.

Chris
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Old 12-27-2003, 09:32 PM
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there is the thing when it starts it squirts fuel... and last time I was there it wasn't starting and there was no suirting.... well there was for like 1 of the times and then it stopped and won't squirt anymore
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Old 12-27-2003, 09:53 PM
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Pull the module from the distributor and get it checked at the parts store.

Oops I forgot you live in Canada, do you guys have Autozone or a chain store like them that does testing like this for free?
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Old 12-27-2003, 11:41 PM
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Well I dunno if there is in our small town.

Umm but bstmech I don't think it is the ignition module, the engine isn't getting gas from the injectors
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Old 12-28-2003, 06:06 AM
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The injectors are triggered from the computer it is triggered from the Ign module and they will go bad and still have spark. Test it or replace it and you may want to change the coil also if it has never been replaced they will develop very high switching Resistance and kill the ign modules.
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