1989 maf relay questions
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Cruising
Joined: Jun 2013
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1989 maf relay questions
Three day ago I installed a new MAF Sensor. Solved my problems for 1 day. I coded a bad MAF relay power sensor. I changed both the power sensor and the burn sensor. Definitely not running as good as before I changed the last two sensors. any advice.
Thanks
Dan
Thanks
Dan
Race Director
Joined: Apr 2002
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From: Anaheim CA
Swap the connectors on the relays. The relays have the same part number so they will work in either position.
Note that ifl the MAF burnoff test fails the MAF wire will gradually get dirtier and dirtier. The car will run correspondingly bad as the wire gets dirty.
Which error code did you get?
Note that ifl the MAF burnoff test fails the MAF wire will gradually get dirtier and dirtier. The car will run correspondingly bad as the wire gets dirty.
Which error code did you get?
Last edited by Cliff Harris; Jul 16, 2016 at 01:45 AM.
Thread Starter
Cruising
Joined: Jun 2013
Posts: 12
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Swap the connectors on the relays. The relays have the same part number so they will work in either position.
Note that ifl the MAF burnoff test fails the MAF wire will gradually get dirtier and dirtier. The car will run correspondingly bad as the wire gets dirty.
Which error code did you get?
Note that ifl the MAF burnoff test fails the MAF wire will gradually get dirtier and dirtier. The car will run correspondingly bad as the wire gets dirty.
Which error code did you get?
Dan
Check engine always comes on after setting a while. Indication of what?
Last edited by baileygo; Jul 16, 2016 at 02:24 PM.
Instructor
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I had the same issue on my 88. It was my burn off relay. I was throwing the same code. Replace the relay and the code cleared. How it was explained to me is the burn off occurs A few seconds after the engine has been shut off. And carries on for a couple of seconds. If this fails it will throw the code 36. So you can be driving the car initially and have no code, shut the engine off and the next time you get in the car and started it will have the code.
That's how was for me and it stayed that way until I fixed it. I use the little dielectric grease also. Also as I had that code for a while until I figured it all out got parts at etc you may want to hit the MAF sensor with some cleaner.
That's how was for me and it stayed that way until I fixed it. I use the little dielectric grease also. Also as I had that code for a while until I figured it all out got parts at etc you may want to hit the MAF sensor with some cleaner.
Last edited by Big Bird 88; Jul 16, 2016 at 03:04 PM.
Thread Starter
Cruising
Joined: Jun 2013
Posts: 12
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I had the same issue on my 88. It was my burn off relay. I was throwing the same code. Replace the relay and the code cleared. How it was explained to me is the burn off occurs A few seconds after the engine has been shut off. And carries on for a couple of seconds. If this fails it will throw the code 36. So you can be driving the car initially and have no code, shut the engine off and the next time you get in the car and started it will have the code.
That's how was for me and it stayed that way until I fixed it. I use the little dielectric grease also. Also as I had that code for a while until I figured it all out got parts at etc you may want to hit the MAF sensor with some cleaner.
That's how was for me and it stayed that way until I fixed it. I use the little dielectric grease also. Also as I had that code for a while until I figured it all out got parts at etc you may want to hit the MAF sensor with some cleaner.
Thanks for your advice. PS Are your wire sets straight up from below or crossed at switches.
Dan
Thread Starter
Cruising
Joined: Jun 2013
Posts: 12
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Thanks you guys.
Dan
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Thread Starter
Cruising
Joined: Jun 2013
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Thread Starter
Cruising
Joined: Jun 2013
Posts: 12
Likes: 0
Instructor
Joined: Apr 2016
Posts: 163
Likes: 4
Baileygo,
I'm wondering if the burn off is happening or not.
Go for a long cruise in the car. Some will tell you either get it up to temp or make sure it goes closed loop.
When you get home, leave it running. Pop the hood and disconnect the front part of the air cleaner assembly so that you can see the screened part of the MAF and the element inside.
Have someone shut the car off for you while you are looking at the element.
After a brief period of time (few seconds) the Element should glow to clean itself (kinda like a self cleaning oven)
There is also a way to test the actual relay too, but someone smarter than me will have to explain that. Basically you will apply power to it and take readings from certain pins.
There is a small diagram on the relay that indicates its function.
IF the burn off relay is working and the MAF is working (Idling good and burning as needed) then I guess the next step would be Ask Cliff if I need to replace the ECM.
I'm wondering if the burn off is happening or not.
Go for a long cruise in the car. Some will tell you either get it up to temp or make sure it goes closed loop.
When you get home, leave it running. Pop the hood and disconnect the front part of the air cleaner assembly so that you can see the screened part of the MAF and the element inside.
Have someone shut the car off for you while you are looking at the element.
After a brief period of time (few seconds) the Element should glow to clean itself (kinda like a self cleaning oven)
There is also a way to test the actual relay too, but someone smarter than me will have to explain that. Basically you will apply power to it and take readings from certain pins.
There is a small diagram on the relay that indicates its function.
IF the burn off relay is working and the MAF is working (Idling good and burning as needed) then I guess the next step would be Ask Cliff if I need to replace the ECM.
Last edited by Big Bird 88; Jul 20, 2016 at 08:02 AM.
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From: Clemson SC
Thanks, Big Bird. Trying to figure out my Code 36. I finally found the sketch in my FSM but was still not sure that I was looking at the right relays. Was not expecting them to be so far from the MAF. Have a great day!