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The fog lights on my '89 have always switched on and off independent of the headlights. Now they only come on with the low beams. I have a fsm but have yet to find a good wiring schematic for troubleshooting. Any suggestions to find the problem!?

Does anyone out there know the correct part number for an intake manifold gasket for an 89 L98 with stock aluminum heads? The parts store listings show a lot of different ones. Some have the rear port blocked off. Some have the center port baffled with metal. All different port sizes. I...

Anybody have any idea about what is causing this problem? 1989 L98 started to misfire while driving down the road. This is what I checked so far: -No codes registered. -Checked all ignition wires with inductive timing light. All flashed OK. -Fuel pressure OK (50 psi +/-) -Replaced...

The 700R4 in my '89 has been having an intermittent problem. Under hard accelleration when in OD over 55 mph, it suddenly feels like it comes out of gear and the engine revs free. Sometimes it will vibrate bad and feel like it's trying to shift back in. Other times, you can let up on the...

For the last few months, I have been having a problem with the contacts on my distributor cap. I first start noticing misfiring on acceleration. If I clean the contacts with sandpaper or scrape them with a file, it runs great again. I've tried caps with brass and with aluminum contacts. The same...

After 200,000 trouble-free miles on my 89 L98 without ever opening the engine, I did a complete rebuild. Valve job, new pistons, rings, bearings, oil pump, ZZ-9 cam, roller-rockers, big-mouth manifold, large tube runners, ported plenum, 52 mm TB, PROM, etc. It ran great for a week, about 150...

I'm nearing completion of my engine rebuild and I have this part left over. I thought I had everything tagged and bagged but this one doesn't show up on any photos. Does anyone know what it's for and where it goes? The car is an '89 L98 auto. The fitting is about 2" long and has what appears to...

I am planning to rebuild my 89 L98 and am looking for recommendations for good setups that have been tried and proven successful. As a base, I am planning a typical rebuild consisting of a valve job, rings, rod and main bearings, gaskets, lifters, push rods, oil pump, etc. This engine has run...

OK, this is driving me a bit nuts. I've driven my '89 for 14 years and thought I've seen it all. Just turned 200,000 miles and the car has been great. Other than normal maintenance stuff (which I do mostly myself), never had any serious problems. The engine has never been opened up. So...

I have a LTPWS light on. Is there any way to determine which wheel sensor is faulty other than dismounting tires one at a time? Any other tests that can be done to troubleshoot this system?

I have had an SES Code 36 for some time now. I haven't noticed any performance problems. In reading some of the threads on this code, I understand that I should check the MAF relay and MAF burnoff relay. My question is, where are they located on a 1989 C4? I found 2 relays behind the...