Hesitates when engine is cold
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Beginning Member
Joined: Nov 2013
Posts: 39
From: Kenosha Wi
Hesitates when engine is cold
My 99 blazer 130k miles hesitates when its first started up. I changed the fuel pump and injectors all with delco replacements and did a complete tune up delco cap rotor plugs and wires. It only does this if I don't let it warm up and I have no check engine light either.
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Joined: Mar 2009
Posts: 8,453
From: Belleville, Michigan
After the vehicle sets for 10 to 12 hours, and before you start the engine, use a scan tool to compare ECT, (engine coolant temperature), IAT, (Inlet Air Temperature) and ambient temperature. They must all be within a couple of degrees of each other.
Post your results.
Next step is check fuel pressure and leakdown. This link explains: https://blazerforum.com/forum/2nd-ge...eakdown-88305/
Post your results.
Post your results.
Next step is check fuel pressure and leakdown. This link explains: https://blazerforum.com/forum/2nd-ge...eakdown-88305/
Post your results.
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