Question about Cars & Trucks
CHECK FOR YOUR SPARK HT LEADS IF ARE CORRECT IN FIRING ORDER. CHECK FOR YOUR CRANKSHAFT SENSOR,OR CAM SHAFT SENSOR. ALSO DO AGAIN A DOUBLE CHECK FOR YOUR TIMING MARKS AND FITTING.
Posted on Apr 22, 2014
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Posted on Jan 02, 2017
SOURCE: wont start
Make sure that you're getting spark. A very common thing on these engines are coils going bad. If you can verify spark, check to make sure you have an injector pulse. As you rotate the engine, look inside of the throttle body and make sure that you see fuel pulsing into the engine. You can still have good pressure but you don't have an injector pulse, the fuel still cant get into the engine. You can use a test light as well to test for an injector pulse. One wire going to the injector will have constant power and the other will blink when the engie is rolled over. Does it start if you spray starting fluid into the throttle body? If it does, it's a fuel delivery problem. Again be sure you have spark from coil to distributor and plugs. You can remove the ignition module and take it to NAPA and they have a module tester. Have them test the module several times not just once. This will eliminate the possibilites of an intermitted problem. Let me know how it does. email@example.com
Posted on Aug 21, 2008
Check your intake and exhaust modules. I have a 1987 D21 and had the same problem (if I understand your post). I replaced the modules located behind the driver side headlights and it fixed the problem. Good luck! I hope this helps.
Posted on Nov 14, 2008
SOURCE: Chevy 454 back fire
Ignition timing is set by the computer as long as the distributor pickup point is within reason.
It could be running too lean. One of the TBI injectors may be sticking or not working (wiring or computer problem), or fuel pressure could be low.
Posted on May 21, 2009
it may not be a vacumn leak from a line,check the throttle shaft for movement,for example,i had a 89 1 ton 350 and my throttle shaft was moving around a lot and in order to keep it from idling high,i had to kick the throttle pedal.But also check the idle air control valve,which is the round sensor on the side of the throttle body.
Posted on Sep 11, 2009
I have same problem, Chevy told me it was probably a seal affecting fuel air ratio and when warm seal expanded to stop air leak. I forget which seal but they also said to check plastic case around seal because it will warp and may also need to be replaced. It was located near top center of engine. Please let me know if you figure it out.
Posted on Sep 14, 2009
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