h0troddin

I can't figure out why my car is running so rich, but I realized today that a MAF sensor from an 86 is different from an 85. Right now i'm running an 86 sensor on my 85 and it runs pig rich. I'm desperate to try anything to solve this problem I'm having or else I'm stuck with parting it out. Anyone have any ideas? When I drive it I cant seem to get more than 3k out of it, it seems stuffed up (cat?). Also, my new plugs are now fouled and I still dont get any codes.

Demonic85

Ah same problem I had when I replaced mine. The ones for the '86-'89 have a different signal. One is digital, the other is analog. You will need the one for an '85 though to make it run properly.

If you look at the bottom there is a part # listed.

'85 (0280 213 002)
'86-'89 (0280 213 004)

h0troddin

Wow!!! I finally fixed the main problem with the car! All along I had the wrong MAF on the car. The last three numbers were "009" instead of "002". Who knows what MAF that belonged to. It starts up after a couple of cranks (cold start injector block off) and runs like a champ. It was funny to see all of the soot come flying out of the exhaust as it was warming up. Thanks Demonic85, you're a lifesaver!

Midnight 85

I just want to set the record straight here, you CAN run a newer MAF in an '85 with no problems. I was having problems once right after I got my '85 when I had the good fortune to meet Gordon Killebrew. I told him my problems and he said my MAF was shot, then he told me to go get a newer MAF such as an '88. The reason? '85 was the first year for the MAF on the Vette and they are scarce so they are more expensive, the newer ones are more plentiful so they are cheaper. That was 6 years ago and my '85 is still going strong with an '88 MAF in it. Miles, I'll bet a dollar to a donut that if you put the MAF that was giving you trouble in another Vette that it will not run properly, it's defective.

ladystoy69

i know this is an old post but for those few people that actually really do use the search feature i figured would be nice if the info was correct.

i dont really know anything about the interchangability to and from the diff years as there is so much info both ways but i just wanted to correct the years and part numbers.

there were actually 3 bosche part numbers used on the tpi's
85 (0280 213 002)
86-87 (0280 213 004)
88-89 (0280 213 009)
some may have also had a gm part number on them 10046030 pretty sure this is # for the 86-87

as far as i can find the 86-89 are same cross referance interchange number.

also as far as i remember non of these are digital, there all analog

Cliff Harris

I'm pretty sure all the Bosch MAFs are digital.

There were some analog MAFs made by AC Delco, but I don't think they were used on a Corvette.

This is wrong. See post #10.

ladystoy69

i'm under the impression if they were digital then there signal would only be able to be checked with special equipment and would read in Hz.

analog can be measured with a regular dvm and results in 0-5 volt signal

as i understand it ours at least in the older c4's are nothing mare then a resistance hot wire.

gerardvg

I have heard the 85 maf is analog and a one year only maf, however i have an 88 maf in my 85 for the last 10 years no codes and great mileage.
Have you checked all cylinders are firing? an easy test is start the car from stone cold, run it for 10 or 20 seconds and check the exhaust an inch from the heads, if one is cold you know where to concentrate on. I had an injector connector conductor in the plug cracked that was all it was.
Also check your timing if it is retarded do the basics check your throttle position sensor (top two wires should be 0.54 volts dc)
Check your ignition leads with a multimeter.
Good luck

norman19

I have a 88 vette keep getting code 33 replaced maf with and adjustable granittli maf replaced both relays. still get code 33. car has bbk throtalbody coldair induction. im stumped any help out there

Cliff Harris

Wow. I got that completely backwards. It's the other way around.

All Bosch MAFs are analog and the Delco's were digital.