Anyone have the correct part # for a '85 relay for a 6-cyl Camaro. The aftermarket fuel pump relay I got at Advanced: MR22, is not the one. It makes the car run worse. I have just replaced MAF and I just put the old relay back in. No blown fuses, no codes set so far.

I want to replace all the electronics to clean up everything.

Thanks.

 

I don't think that I made my post very clear. The Relay I bought was to replace the MAF Relay. Advanced only had a fuel pump relay. This did not work for the MAF. The car started and idled but off-idle acceleration in neutral or in gear was stubborn and the car hesitated and bucked.

Replaced the MAF $70 because of a code 34, cleared the codes and then drove it for a good 150 miles. No amber light. Stopped for gas and took off and guess what. Amber light comes on before even hitting the on-ramp. I know the car was in closed-loop for awhile so how come the car suddenly throws the 34 code after it's sitting while getting gas fully warmed up I might add?

I could really use some help now because I'm at a total-loss. I'm thinking now of getting the K&N intake kit or replacing the TPS since that sensor and air flow are in the loop here for this problem well.

The Service Manual says the Code 34 will set higher than 2300 RPM when the flow of air or voltage lower than specified range for over a few seconds with 20% TPS sensed. This car is a 5-speed with 3.4 which used to be a 2.8 that did the same thing. My injectors are the 3.4's

Any ideas? TomP, KED85?

Chevman.

 

:edit: Okay, scratch that.

There is a fuse for the MAF as well. It should be mounted on the passenger side frame rail, right next to another one that is for both the ECM and fuel pump (easier to pull this fuse to reset the ECM than it is to reset your radio presets and fool with the battery terminals), and have a red and a black wire coming out of it. The fuse is a thing that looks like a connector that does nothing that's bolted to the frame rail.

If the fuse passes the test, then start the engine (if you can). Tap on the MAF when the engine reaches operating temperature. If the engine stumbles or misses, the MAF is bad. If the engine passes this test, then unplug the MAF. If the engine runs better, the MAF is bad.

BTW, the MAF runs about $200 or so...

Also, are you sure you replaced the right relay? The MAF relay is not in the "book" of relays that are mounted on the firewall--it's separate.

 

Checked fuses by sight looked ok, I know where these are. I could try the digital meter test though.

The MAF Relay is the one by the battery, that's the one I replaced, but put back in because the car ran too rough. I could use a part number because the GP brand part number MR22 from Advanced was not the right one. Advanced sold me a MAF for $70 not a rebuilt but new.

 

Ok, had to make sure you replaced the right stuff.

I personally don't really trust GP Sorenson for their more expensive stuff. That's why when I had to replace my ignition module I went with GM parts. Yes, for some of the cheaper sensors (oil pressure sender/switch unit, coolant temp) I went and bought the rebuilt cheapies.

I would scrounge around on the classified boards here to see if you can score a working MAF--that's how I got mine.

BTW, im my experience (on my 87, anyways) most, if not all, of the relays are exactly the same...

:edit: I looked up a part number for you at the AAP parts website (www.partsamerica.com). The part number for the MAF relay for my 87 is MR82.

 

thanks for the part number, Maverick. I suppose that part is GP.

The MAF I bought was Interparts or something along those lines, not GP, but my old Relay is full of old electrolytic grease and looks real cruddy, would like to replace. I knew the MR22 was not the right one, it must be making the switched connection on some other posts on that relay.

Chevman

 

Might want to clean ALL of the terminals real good before you put the new relay in. That stuff is bad news for electrical connections...

 

Are these MAF Relays any different? The one on partsamerica for the 85 is neither of these but there is a part number but no schematic:


GP Sorenson MR22 Fuel Pump Relay:

http://www.partsamerica.com/ProductD...artnumber=MR22

GP Sorenson MR82 your 87 MAF Relay, unsure whether yours has burn-off.

http://www.partsamerica.com/ProductD...artnumber=MR82

Niehoff MAF Relay for 85 2.8 litre MPFI

http://www.partsamerica.com/ProductD...number=RL33221

These links may ask for a zipcode.
Chevman

 

BTW, I should have said it's neither of the GP Sorensen parts. The Niehoff is.

 

I used the MR22 because they only had a part number for the fuel pump relay. The parts counter guy said that there was "no such part existant on the vehicle" for a MAF relay on a MPFI V6 car. The MR82 may be the burn off relay for V8 cars.

Oh, and the system asks for a zipcode so that it can "scan" the closest store's inventory to see if a particular part is in stock...

I'd check the connectors next. Depending on how many times either of the parts has been disconnected, the terminals may have been spread out and lost contact...

 

Don't know if the problems fixed yet- but is it definately the maf relay? You mentioned the service manual; did you run thru the code 34 chart?

I've been running off of the same rebuilt MAF for the past 8 years or so... altho I think it was only $60 back then

 

Tom,

I'm going to check the circuitry and the 5V ECM signal next. I don't have the car right now, wife's driving it as is.

I'll check grounds, the 12 volt power circuits that trigger the Relay and then pass through it to drive the MAF, and clean all the wiring. Read somewhere that the biggest problem is ageing on these cars.

Chevman

 

mine's unplugged- idles fine, but a little peaky...