I was talking to my car the other day (86 2.8l) and it told me to check the MAP sensor... it would tell me what it is or where it is though. Could you guys help me out?
When i start my car it starts at 10rpm then shoots up to 20rpm and goes back down to around 7 rpm and the check engine soon light comes on.

 

Actually, you don't have a MAP sensor. Was the error code 33 or 34? That's the MAF (Mass Air Flow) sensor. You didn't say if you have a Camaro or Firebird, so I can't tell you 100% exactly where it is, but it's easy to find. Just look at the air intake tube coming off your throttle body. It's the sensor (with a 3-pin connector) betwen that intake tube and your air filter box. New from GM is about $300; a Pep Boys or Strauss or etc "lifetime replacement" one is about $80-$100. Definately get the lifetime'r... it'll be worth it in the long run.


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
---Think your car could be pic of the week? Visit http://www.f-body.net for details!

 

I have a camaro... and it does say MAP according to the error code charts.

33 (three flashes, pause, three flashes) MAP sensor Check vacuum hose(s) from MAP sensor. Check electrical connections at ECM. *Replace MAP sensor

Could it be a typo? I am refering from the Haynes auto repair manual for thirdgen camaros

[This message has been edited by mrzud (edited March 06, 2001).]

 

Okay, don't believe me, then! You'll spend a lonnnnng time looking for the MAP sensor, though.

[edit] If by some chance I was right, and you do have a MAF sensor, then your Camaro would have it placed right between your Y-shaped (dual-snorkel) airbox and the throttle body's intake tubing.

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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
---Think your car could be pic of the week? Visit http://www.f-body.net for details!

[This message has been edited by TomP (edited March 06, 2001).]

 

TomP is absolutely correct if that is the original engine for your car...its a MAF sensor as 2.8s were MAF cars until they changed over to SD (MAP based) in 1989 or 1990.

GM just reused the codes for the MAF system on the MAP system (no need to reserve MAF codes when you don't have MAF/so GM reused them)...so the code book is for a 89/90 and newer car.

If you are STILL in doubt, trace your intake from the air cleaner to the Throttle Body and you will see a "device" somewhere in between...that's the MAF.

As I said, the ONLY way you could have a MAP/SD engine, is if someone replaced it with a newer engine.

 

Just a support post to what's already been stated.. in '86 our cars had MAF sensors, not MAP sensors.. same trouble code, just a different sensor per model (85-89 2.8l MPFI uses Mass AirFlow, 90-92 3.1l MPFI uses Manifold Absolute Pressure (superior system, aka speed density))

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'86 Camaro SC, black /w silver racing stripes
2.8l MPFI/700r4 /w special 2nd gear delete option
In search of new v8 engine & transmission, now contemplating t5 swap to get me out of this mess.
MSD coil, Accel 8mm wires, SplitFire plugs, Gabriel hijackers

 

its not that i didnt believe you. i thought they meant maf in the first place. it is just that the book said map. thanks for the help though.

 

the haynes manual says maf sensor in the updated chapter (supplement for 1985 and newer models) (chapter 13 in the firebird manual) and in (i think) chapter 6 - emission controls it says map sensor
that might have been why

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Stock 2.8 MPFI auto w/ Flowmaster 40, More to come......
New Pioneer Head Unit
2x 10" Pioneer subs powered by 300 Watt Jensen amp
2- 6x9" Pioneer (rear)
More to come..... (hey, i dont got a job yet)

 

ok...thanks