How can you tell if ECM is Bad? at the end of ideas

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12-19-2018, 10:56 PM

Bayla

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Join Date: Dec 2018

Posts: 19

How can you tell if ECM is Bad? at the end of ideas

I have a 1995 with 4.3 vortex that will crank but not start...I have replaced, Mass air, MAP, cam position, crank position, distributor, rotter, wires, plugs, O2 sensor, Fuel Pump, Fuel Filter......has great compression...I'm out of ideas....could use some advise from someone smarter than me

12-20-2018, 07:13 AM

LesMyer

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Join Date: Oct 2014

Location: North Central Indiana

Posts: 3,052

Quote:

Originally Posted by Bayla

#1: Have you had the distributor out? if so, was that when the engine stopped running? #2 Do you have spark at the coil while cranking? #3 Will engine start if you pour a little gas down the throttle body?

12-21-2018, 11:48 AM

Bayla

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Join Date: Dec 2018

Posts: 19

Thanks you for replying..You won’t believe what it was!! ECM computer connector worked its way loose!! I never would have found it..got desperate though might need a new ECM

I’m new to Blazerforum and a new owner of 1995 GMC Jimmy 4x4....I bought it for $1,500..145,000 miles..Suposed to be a backup truck ...now I fell in love with it trying to restore..I have lots of questions

lol thanks again