C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

86 quit running, when I hit a bump

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Old Jan 21, 2007 | 10:01 PM
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Default 86 quit running, when I hit a bump

I got an 86. Never had a problem, I'm going home from work, I hit a little bump in the road, bam, It quit running. I tried to restart, it turned over, but would not start. I had it towed home. The fuel pump runs.(I put power to th G terminal) I connected a pressure guage on the fuel rail. 42 pounds or so. I released pressure and the flo hose pumped fuel. It is like it is not going passed the fuel rail into the injectors. HELP, I need ideas.
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Old Jan 21, 2007 | 10:04 PM
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Don't know if the bump in the road is a coincodence or not. Never-the-less, it seems you have fuel pressure. Have you checked for spark? Could also be a loose ground.
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Old Jan 21, 2007 | 10:21 PM
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Check for spark (use ST125 or similar) & fuel injector pulse*. Make sure the Check Eng Light comes on when you turn the key on. (It should) If you have scanner access, see if it has any stored codes.





(*can hold a long screwdriver up to your ear, like a stethescope, with the tip on the injector. should clicking from injectors when helper cranks eng over)
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Old Jan 21, 2007 | 11:34 PM
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check the connector to the maf. mine shut off when the clip was broken and the connector loosened a little
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Old Jan 22, 2007 | 01:31 AM
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Check the fuse panel?

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Old Jan 22, 2007 | 02:43 AM
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Originally Posted by coupeguy2001
check the connector to the maf. mine shut off when the clip was broken and the connector loosened a little
Those suckers can come loose..Check the main power lead going into your distributor also. If the clip is broken (most are) it could have jarred lose.
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Old Jan 22, 2007 | 09:39 AM
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lose connection somewhere and that's the most obvious.
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Old Jan 22, 2007 | 09:42 AM
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Old Jan 22, 2007 | 06:46 PM
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Try the ECM sometimes it will short out.............mine did on a 1990
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Old Jan 22, 2007 | 07:12 PM
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I would check the ECM grounds as well. I have disconnected the MAF while at idle and the engine did not die. Just set a code and changed the idle. The chip in the ECM has a default setting incase something like that happpens and it will run in "limp home mode".

Making sure the cylinders are recieving spark and fuel is the first place I would look. Also you can use your finger on the injector connectors when cranking to see if you feel clicks.
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Old Jan 23, 2007 | 05:54 PM
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spark is fine. Engine will run when squirting starting fluid in.
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Old Jan 23, 2007 | 05:54 PM
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checked all fuses, they are fine
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Old Jan 23, 2007 | 05:57 PM
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Originally Posted by jghmczo6
Try the ECM sometimes it will short out.............mine did on a 1990
How do I check if the ECM is Ok
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Old Jan 23, 2007 | 06:37 PM
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Just throwing this out. but mine died one day. My chip came loose in the ecm.

I think it threw a code though.
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Old Jan 23, 2007 | 07:27 PM
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Start the car let it run a minute ot two then slap the ECM with the palm of your hand (not too hard) if the ECM is bad the car will shut off immediatly. First time a service writer did that to my car I was astounded. The good news I did not get stuck somewhere and could not get home without waiting for a tow. Hope this helps
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