Hi Guys
have some problems with that when the engine is coldstarted it runs great, but when in normal run temp it starts to miss out sparks when pushing down the gaspedal.
Have replace almost everything except the ignition coil and the ignition unit down under in the distributor ( have changed the little coil in side the distributor as well )
New Injectors Bosch III, all new around the TPI, even a new ECM from Dynamic EFI.

I am not sure if it actually is missing out sparks, or if the spark is drowned by to much gas.
When on run temp engine , if I push the gas gently and slowly rev up to over 3-4000 RPM , gear by gear, it does not cough as much,

Can it be so that when the ignition coil comes up in temp the actual sparks is less voltage compared to when the coil is cold , wich by that does not jump as good as it should on the spark plug ?
Or , is it that the engine accepts the possibly higher gas flow when it is cold, and gets kind of drowning when it is warm ?

Any ideas ?

Best from a summer hot Nybro in Sweden.
//Bo
bo@franzens.se

 

Sounds like distributor problems

 

Hi , Did change both cap and rotor in when doing the TPI job, even the small coil inside the distributor, is there more to it ?
it is ok when cold engine and not so well with warm motor ...
Best //Bo

 

I'd suspect the Ignition Control Module; you can find test procedures here: https://easyautodiagnostics.com/gm/4...ed-icm-tests-6

 

Thanks,
As the cars run fine when cold, from closed throtle up to WTO , gear by gear and goes fine when running in like 55mph , but starts to "cough" when in full running temp.
the coughing appears when pushing the pedal a bit, but not so much if I downgear 1 step before pushing the gas pedal. Can it really be the ICM ?
Best //Bo

 

It "can" be a number of things; that's where troubleshooting the problem comes in rather than just wholesale-replacement of parts. Electronic components are sometimes particularly susceptible to getting fussy with applied changes in temperature as they age; that's why I suggested it 'might' be the ICM when you stated that the problem appears as the engine heats up.

Again, it's up to you to do the troubleshooting; I've merely offered some direction from which to start.

GL

 

Thanks Ironwill, thats my thinking to.

Best //Bo