Crank no start, it has have fuel and spark

LESMESS

MEMBER
1990 CHEVROLET SILVERADO
5.7L
V8
4WD
AUTOMATIC
73,000 MILES

New coil, pickup coil, ignition control module, distributor cap, rotor, fuel pump relay, fuel filter. Ejectors in throttle body fire and spray gas, but gas in cylinders will not ignite. Have spark, but it is very weak (yellow/orange instead of blue/white) Does not appear that spark is hot enough to ignite compressed gas. With everything spark related being new (except coil wire and plug wires) why no nice high voltage spark at my plugs? Any help appreciated.

4 Replies

JOHNNY G.JR

MECHANIC
320 POSTS

Check plug wires with ohm meter.

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Thursday, September 3rd, 2020 AT 9:54 AM

KEN L

MASTER CERTIFIED MECHANIC
42,940 POSTS

Hi there,

Sorry to hear about your troubles, I have some guides for you to check out, please run some tests and get back to me. Lets see if the engine has compression

https://www.2carpros.com/articles/how-to-test-engine-compression

then check out this guide to back over the basics

https://www.2carpros.com/articles/car-cranks-but-wont-start

Please let me know what you find.

Best, Ken

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Thursday, September 3rd, 2020 AT 9:54 AM

LESMESS

MEMBER
6 POSTS

New coil, pickup coil, ignition control module, distributor cap, rotor, fuel pump relay, fuel filter. Also now have replaced spark plugs, plug wires and coil wire. Ejectors in throttle body fire and spray gas, have spark but to start or even firing. Compression checks out. Still no start. Could I have screwed up distributor installation after replacing pickup coil? It just seems like the spark is not at the cylinder that has the gas at any point in the start attempt.

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Thursday, September 3rd, 2020 AT 9:54 AM

KEN L

MASTER CERTIFIED MECHANIC
42,940 POSTS

Yes the distributor can be in wrong, if you removed it and installed it without moving the oil pump drive backwards just a little you are one tooth off, its in possible to get the distributor back in the same way it came out without doing that, put the engine on top dead center and remove the cap, the rotor should be pointing right at #1 or #6

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Thursday, September 3rd, 2020 AT 9:54 AM