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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LT1 dying unexpectedly.

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Post  kelleysj on Thu May 16, 2013 7:21 pm

Car running and then after about a ten minute drive it will die and wont start back up for about 5-10 minutes. affraid Im still in the test phase of my project. I dont have a MAF yet so maybe that is it. Other than that all components are brand new. My OBD1 scanner wont link to my car so i cant read any fault codes. Has anybody had this issue? Any help would be great its summer and i want to drive! Very Happy
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Post  spence on Fri May 17, 2013 7:49 am

Get your odb port working first and start from there.
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Post  Admin on Fri May 17, 2013 7:58 am

Yep, I think they call it an OPTI SPARK!!!!!! Evil or Very Mad

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Post  kelleysj on Fri May 17, 2013 11:14 am

If it is the optispark i may flip its a brand-new gm opti Twisted Evil


Last edited by kelleysj on Fri May 17, 2013 11:14 am; edited 1 time in total (Reason for editing : typo)
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Post  948 on Fri May 17, 2013 12:11 pm

Admin wrote:Yep, I think they call it an OPTI SPARK!!!!!! Evil or Very Mad

+1

If it is spark related the ICM can cause problems like that.....
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Post  kelleysj on Fri May 17, 2013 12:46 pm

Anyway to test the ICM? IT seems to happen when the engine gets to operating temp.
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Post  kelleysj on Fri May 17, 2013 12:57 pm

I believe that was a auto zone special (ICM) and if so i have learned my lesson.
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Post  kelleysj on Fri May 17, 2013 1:35 pm

Can a ICM be bypassed with a MSD box? if so i have one laying around if may be fate.
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Post  spence on Fri May 17, 2013 2:01 pm

kelleysj wrote:Anyway to test the ICM? IT seems to happen when the engine gets to operating temp.

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Post  948 on Fri May 17, 2013 5:12 pm

kelleysj wrote:Can a ICM be bypassed with a MSD box? if so i have one laying around if may be fate.
No, msd box still needs a signal to fire, which comes from the ICM.
Also, It is common for LT owners to space the ICM away from the cylinder head; due to the heat.
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Post  kelleysj on Fri May 17, 2013 5:17 pm

I will try spacing it to see if that helps. Also what should I look at first to diagnose my obd1 that will not link up with my reader.
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Post  948 on Fri May 17, 2013 7:01 pm

kelleysj wrote:I will try spacing it to see if that helps. Also what should I look at first to diagnose my obd1 that will not link up with my reader.
Spacing won't help if it is already bad.
To test for the bad component you will first need to duplicate the problem.
Have you determined it is indeed a spark problem?
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Post  kelleysj on Fri May 17, 2013 7:18 pm

off all the recounts of others on the LT1 forums it sounds exactly the same. Im not sure if i could duplicate the issue unless i do it after it stalls during driving which at that moment im usually on a road somewhere. I have let it run at idle but no issues then. I will have it tested if its still good re apply some thermal compound to the heat sink and space it from the head and have someone follow me on my next test run.
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Post  spence on Fri May 17, 2013 8:07 pm

kelleysj wrote:I will try spacing it to see if that helps. Also what should I look at first to diagnose my obd1 that will not link up with my reader.

Check the wiring. [You must be registered and logged in to see this link.] Is yours the 12pin or 16pin?
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Post  kelleysj on Fri May 17, 2013 9:24 pm

Mine is the 16 pin. Its the 95 so obd1 with the obd2 connector.
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Post  Admin on Sat May 18, 2013 8:40 am

If it is an Autozone electrical part, that is more than likely your problem.
Do not buy any electrical parts from autozone , they are mostly junk......

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Post  kelleysj on Sat May 18, 2013 9:30 am

Not sure if it is but I'm thinking that's where I got it I will get a better look at it today.
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Post  bluehellfire666 on Sat May 18, 2013 1:50 pm

Unfortunately when I had this problem it was the optispark...however the ICM can cause the same problem and may be the culprit...check [You must be registered and logged in to see this link.] for wiring diagrams and pinouts, that site should have what you need to check the wiring for the diagnostics port on your engine
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Post  bluehellfire666 on Sat May 18, 2013 1:59 pm

Although...when i did have my optispark going bad, i was able to let the car sit and idle until it shut off, then diagnose, i had to let the car sit and idle for a LONG time though
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Post  944-LT1 on Sat May 18, 2013 2:34 pm

^ Same here. As well, when my opti died, the computer did not put out any code...which made it all that much more fun.

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Post  bluehellfire666 on Sat May 18, 2013 4:00 pm

Mine actually put out the code for a faulty ICM, which made it VERY interesting...you have to watch out with OBDII, i don't know much about OBDI, but with II i found out through researching that the codes for a bad ICM are often thrown when the optical pickup in the optispark is going bad...good luck brother, I'm praying for you.

Just a quick question for the original poster: When you installed the optispark, was it sitting flush to the timing cover, and did it drop on smoothly without hesitation? I ruined an opti (thank God it was used) by putting it on just a little bit off, and then trying to pull it in with the bolts...I'll never do anything that dumb again lol.
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Post  kelleysj on Sun May 19, 2013 8:26 pm

The opti was put on correctly, Im wondering why nobody has just moved the ICM to a cooler area of the car. I have plenty of wire clearance if this is a possibility i may do it. I would assume i would have to ground the ICM itself.
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Post  bluehellfire666 on Thu May 23, 2013 9:21 pm

I believe that is a trick that I've seen used by guys running these engines in their original cars, particularly on F-body's (because I used to frequent some f-body forums)
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Post  RobotMachines on Wed Jul 24, 2013 12:35 pm

I used the Delteq module.  Bought the coil pack on ebay for cheap.  Been running for many years now without a problem:  http://www.delteq.com/

If you use it, you can gut and seal your opti since the only thing used in it, after the delteq is installed,  is the optical sensor & wheel.  


Also, I had my '83 944 LT1 (1994) mysteriously cutting out on me to find that my oil pressure wire running to the computer was loose, and the computer was shutting the car off because it wasn't detecting oil pressure.  Little things like that are so much fun to have happen.
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