944Hybrids: 924/944/968 and 928 V8 Conversions
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HOW TO DO AN ADVANCED SEARCH.

Mon Jul 08, 2013 3:56 pm by Admin


For the benefit of 944Hybrids users there are two search functions available for you to use.
The purpose of this sticky is to explain the "Advanced Search" function because it is much more powerful and is the best choice when researching information.

When you log on to the site a list of options is shown in a line at the top of the page. One option is labelled "Search", use this option (NOT the search box lower down on the right).

After you click on the upper search option, a drop down box appears. At the bottom of this box is a radio button marked "Advanced …

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Engine fails when getting warm under load or idling

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Engine fails when getting warm under load or idling Empty Engine fails when getting warm under load or idling

Post  quarterflash on Mon Nov 23, 2015 3:59 am

Hi everyone
We had our first frost of the year here in the UK last night. Brrr.

Maybe you can suggest a solution to our problem.
Engine: 95 Corvette LT1 350.
Car: 89 944 Turbo, well it was.
Problem: engines takes a while to start but then fires up and runs fine. However after driving for a short while or even idling it splutters to a halt. Leaving it to cool down allows us to start it again no problem.
I don't want to put ideas in your head but does that sound like a coil issue?
All cylinder compressions are good (175 - 200) and it is not restricted to a cylinder or even a bank of 4. The whole engine is affected so it has to be coil, distributor or fuel?

All ideas welcome.
Thanks
Q

quarterflash

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Engine fails when getting warm under load or idling Empty Re: Engine fails when getting warm under load or idling

Post  spence on Mon Nov 23, 2015 5:07 am

Sounds like an optispark or ICM issue.... Read this

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spence
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Engine fails when getting warm under load or idling Empty Re: Engine fails when getting warm under load or idling

Post  kelleysj on Thu Dec 10, 2015 8:37 am

I had this issue with my ICM. I spaced the heatsink with washers since I believed it was overheating due to being mounted to the driver side head. I also removed the ICM from the heat sink cleaned all the old paste off and added Artic silver5 heat sink paste to the sink and ICM remounted it. Since I have done this I have not had one problem with the car dying. This is a cheaper fix to try first before messing with the opti.
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Engine fails when getting warm under load or idling Empty Re: Engine fails when getting warm under load or idling

Post  quarterflash on Thu Dec 10, 2015 8:51 am

Thanks for your help kelleysj. However the diagnostic that has been run since posting this problem indicates an Optispark issue. So a shiny new unit is on its way. I will post the answer when we get it sorted.
Incidentally where have you mounted the ICM. Looks like mine will be under the dashboard with the two brake servos.
Regards
Q

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Engine fails when getting warm under load or idling Empty Re: Engine fails when getting warm under load or idling

Post  spence on Thu Dec 10, 2015 10:54 am

What kind of optispark did you buy? I hope you got an MSD or AC delco OEM replacement.... Anything else is crap and wont last.
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Engine fails when getting warm under load or idling Empty Re: Engine fails when getting warm under load or idling

Post  quarterflash on Thu Dec 10, 2015 11:10 am

It was a difficult decision - do I spend £380 or £180? Especially as I suspect MSD and Ac Delco is made in china these days.
Regards
Q

quarterflash

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Engine fails when getting warm under load or idling Empty Re: Engine fails when getting warm under load or idling

Post  spence on Thu Dec 10, 2015 11:18 am

Yes, the MSD and AC delco cost is more; but I'd still go with those. It's not worth having to pull everything off the front of the engine to do it again... The cheap ones are known for having issues right out of the box.
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