Hello there! I have a 1989 Buick LeSabre Limited with the 3800. It is an automatic with around 145,000 miles give or take. I have had it close to two years now and have done a ton of work myself, I…

KiKiTheKillerKitty

Hello there! I have a 1989 Buick LeSabre Limited with the 3800. It is an automatic with around 145,000 miles give or take. I have had it close to two years now and have done a ton of work myself, I really like how easy the car is to work on. I have had code 43 on the car for a long time, according to my Haynes this is the Knock Sensor Circuit. I should note that the check engine light is not always on, when it comes on it will be during the first 5 minutes of a cold start and go off within the next 5 minutes. The check engine light has never came on while driving, not even during a 1,700 mile drive. When I had the car in shop for tires a year ago I asked them to check out the sensor and they said that it is reading and responding like it works. Now I have done my research and I believe it has to either be the wiring, the sensor or the ECM. The wiring looks all good to me! I mean it is just one wire after all. The sensor looks ugly as sin and old probably stock!

Now for a bit more info that may be useful. After I did a full tune up myself (Timing chain, water pump, belt, crank sensor, cam sensor and magnet, coil pack, spark plugs, spar wires, pcv valve, egr valve, MAF sensor, idle air control, fuel pressure regulator, fuel filter, air filter and intake gasket) The car did not want to say running at all.. HARD stall. I took it into the shop and it turns out the harmonic balanced was cracked (I should have changed the stock one, it had a rubber center and i sprayed a TON of PB blaster on it to get the balancer bolt loose.) They also said that the engine was misfiring and diagnosed it as my melted Ignition Control Module. I should have known all that green sticky gunk on my ICM between the coil packs was not some kind of heat grease! They CLAIMED they tried to put on a new ICM with my new coil pack and it would not work. They claimed they tried to put a new coil pack on with 3 different new ICM and nothing worked. So then they put a junkyard ICM on with the coil pack it came with and it worked.

Sometimes when I start my car it will stall out if I do not give it gas. This is only after I have been driving it around a bit that day. The only code I get when i jump my service pins is 43 (and 12 to indicate test mode). It has never stalled out on me while driving.

Now soon I plan on trying out a Delphi ICM and coil pack from Amazon to see if the shop was just full of it and didnt want to order in a new ICM. On the off chance that the new ICM and coil pack do not work, do you think that the ECM (engine Control Module) is the main problem?

I can't take my car back to the shop and demand a new set of jankyard parts because I moved out of state.

Comments (4)
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KiKiTheKillerKitty
KiKiTheKillerKitty

KiKiTheKillerKitty
KiKiTheKillerKitty

KiKiTheKillerKitty
KiKiTheKillerKitty

Well I ended up returning the parts, Delphi seems like it has really cheap parts! The ICM metal felt and sounded like the kind of metal your pots and pants would be made of and didn't have any heat fins on it.
The Delphi Coil Packs were so cheap that both the first and replacement they sent me were broken by time they got to me! The first pack had two of its connecting fins bent the wrong way and one broken. The replacement was cracked where you plug in the #6 plug wire!

Do you think I should try my luck with some ACDELCO parts or pull off the ICM and Coil from a junkyard car? I was thinking I would throw back on my old set and use it until it burns out more and then try junkyard parts?

Scotty Kilmer
Scotty Kilmer

Editor

try the delphi parts, probably will fix it