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Will not start

Carl_Simpson

By Carl_Simpson
in Ask A GM Technician

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Carl_Simpson New Member

Carl_Simpson

Posted
Posted

Have a 1996 GMC K1500 Suburban 5.7L.

It turns over but will not fire. I checked for spark and it was sparking. There is a strong gas smell at the tail pipe after turning over. I replaced the injector control module and coil and it still just turns over. Not sure what is left. 

Jsdirt Senior Enthusiast

Jsdirt

Posted
Posted (edited)

Spark is good, but CORRECTLY TIMED & STRONG spark is what you need.  You'll also need compression, or else everything else is for naught.

 

What is an "injector control module" ?  You mean the ECM? Or the whole "spider" injection assembly?   Why replace anything fuel-related if you're smelling fuel?

 

Is the spider (or poppets if an updated unit) receiving the voltage to fire? Fuel pressure good? Pump providing correct volume? If not on the last 2 questions, are the powers / grounds good to the pump?

 

If I had to guess on this one, I'd point to the spider assembly - they are notorious piles of garbage, and fail regularly. If it has never been changed, the updated units have individually-fired injectors on them with their own plugs, making testing a bit easier once inside.

 

post-65085-0-48650800-1427030092_thumb.jpg

Edited by Jsdirt

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