85 dies
Thread Starter
Race Director
Joined: Sep 2003
Posts: 16,836
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From: Database Error Indiana
85 dies
Not mine but a GM tech has it. All scan #s look good. FP is at 40 and holds. Acts like its running out of fuel. Idle is good but when you accelerate, it just dies. Just like a bad pump or filter. Ideas ??
Edit. I just called to see if he checked the cat but no answer on that yet.
Edit. I just called to see if he checked the cat but no answer on that yet.
Team Owner
Joined: Mar 2001
Posts: 54,124
Likes: 30
From: Cincinnati, Oh USA
Look for a pinched fuel line or a collapsing fuel hose. Pinched return line will also limit fuel delivery. Use a timing light or a spark tester to see if the spark doesn't lose energy upon acceleration. Measure intake vacuum it should drop when you open the throttle.
Team Owner
Joined: Mar 2001
Posts: 54,124
Likes: 30
From: Cincinnati, Oh USA
Thread Starter
Race Director
Joined: Sep 2003
Posts: 16,836
Likes: 337
From: Database Error Indiana
Tank is not under pressure. Its vented through the charcoal canister. If the return is pinched it deadheads the fuel pump. Fuel has no place to go but through the injectors.
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Safety Car
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Low voltage does that exact thing...the dist module is likely bad.
As RPM increases the voltage in HEI decreases. May idle at 40,000V and drop as rpm increased because there is a trade off for the 'speed' of the ignition...as the speed increases the voltage or pressure decreases. Its traded away. High RPM may drop to 1/2 of what idle voltage was. The voltage is sufficient, thats why it starts so high so there is plenty to spare as RPM increases.
As power is lost,. the voltage drops and eventually cannot fire the plugs. This can come from a bad battery that cannot supply the volts to the module or a bad module & coil that cannot amplify. When the system hits about 10.5 volts the RPM starts getting limited pretty fast...it'll just die from no spark when it drops to around 8.5 to 9 volts.
As RPM increases the voltage in HEI decreases. May idle at 40,000V and drop as rpm increased because there is a trade off for the 'speed' of the ignition...as the speed increases the voltage or pressure decreases. Its traded away. High RPM may drop to 1/2 of what idle voltage was. The voltage is sufficient, thats why it starts so high so there is plenty to spare as RPM increases.
As power is lost,. the voltage drops and eventually cannot fire the plugs. This can come from a bad battery that cannot supply the volts to the module or a bad module & coil that cannot amplify. When the system hits about 10.5 volts the RPM starts getting limited pretty fast...it'll just die from no spark when it drops to around 8.5 to 9 volts.
Last edited by leesvet; Aug 17, 2011 at 07:24 PM.