3.4 ENGINE MISS WHEN WARM

  • Tiny
  • etz
  • Chevrolet Venture

1997 3.4 Chevy Venture, with 118,000 miles. Recently replaced head and intake gaskets, plugs and wires. Engine starts and runs fine when cold. As soon as the engine warms up, a severe hesitation/ miss develops. Engine doesn't throw a code. Should the coils be replaced when the plug and wires were replaced?

Friday, October 19th, 2007 AT 7:33 AM

5 Answers

  • Tiny
  • rasmataz
  • Member

You need a break out box. Check the CPS and ICM before you get to the PCM. Inspect for damages/loose connectors.

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Friday, August 3rd, 2007 AT 10:15 PM
  • Tiny
  • co_ranger
  • Member

Found the CPS, reads 355 ohms. But cannot find any info on what it should read. Cannot find the ICM however, and hear that some of these had the ICM intergrated with the EEC.

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Sunday, August 5th, 2007 AT 7:27 PM
  • Tiny
  • rasmataz
  • Member

Try doing this: Here is a little trick that will literally show you if a DIS module and its crankshaft sensor circuit are working: connect a halogen headlamp to the spade terminals that mate the DIS module to the coils. A headlamp is recommended here because it puts more of a load on the module than a test lamp. If the headlamp flashes when the engine is cranked, the DIS module and crankshaft position sensor circuit are functioning. Therefore, the problem is in the coils.

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Sunday, August 5th, 2007 AT 8:31 PM
  • Tiny
  • co_ranger
  • Member

Well, it ended up being none of that stuff. Corroded ground wire connection on the firewall. Thanks for your suggestions.

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Friday, August 10th, 2007 AT 7:23 AM
  • Tiny
  • blackop555
  • Expert
  • 10,563 posts

Clean and inspect the MAF or MAP. Is engine running hot or normal?

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Friday, October 19th, 2007 AT 8:32 AM

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