Starting Troubles

Tiny
JWASHINGTON
  • MEMBER
  • 1999 CHEVROLET SUBURBAN
  • V8
  • 2WD
  • AUTOMATIC
  • 164,000 MILES
We just replaced the Ignition Control Module in our 99 Chevy Suburban yesterday and from all appearances it seemed to run fine all day today. Then later this evening I was out running errands and ran into a store for 15 minutes came out and it struggled to start as it had before we changed the ICM. Took about 3 or 4 times to start. It eventually started except now the Check Engine light is now on (this wasn't on before). I'm assuming because of maybe a faulty knock sensor now because of the hesitation in starting of the engine? Could we now have a problem with the Knock Sensor and or the Ignition Coil?
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Tuesday, March 29th, 2011 AT 12:21 AM

3 Replies

Tiny
RASMATAZ
  • MEMBER
You need to check what's missing if its fuel or spark issue-Do below to find out more-

Get a helper disconnect a sparkplug wire or 2 and ground it to the engine at least 3/16 away from ground -have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, Do you hear the fuel pump come On when you turn key on? If not check fuel pump fuse and fuel pump relay if so, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, coil's resistances, distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it.
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Tuesday, March 29th, 2011 AT 12:28 AM
Tiny
JWASHINGTON
  • MEMBER
Thanks rasmataz! We will try these out! As we are just at home do it yourself "ers". We did just have the fuel pump and fuel filter replaced by a mechanic in November.
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Tuesday, March 29th, 2011 AT 1:50 AM
Tiny
JWASHINGTON
  • MEMBER
Replaced 2nd ICM. Check EngineLight was coming on intermittently when struggling to start only. Wasn't coming on when starting fine in the mornings (cold engine). Diganosed the codes at AUto ZOne. BAD ICM AGAIN! SO they said either a bad part OR might be a grounding issue? Gave us another ICM and we just replaced yesterday. Has been fine until this afternoon and it took a couple of times to start and now the check engine light came back on (no big surprise). So if there is a grounding issue that is making the ICM go bad, where would that be? Pretty soon Auto Zone is going to stop giving us ICM's even thought they are Lifetime Warranty's. LOL!
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Monday, April 18th, 2011 AT 8:14 PM

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