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Old 11-06-2002, 08:38 AM   #1 (permalink)
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MAP Sensor

Does anyone know how to test the MAP sensor on a 91?

Thanks,

Matt
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Old 11-06-2002, 08:41 AM   #2 (permalink)
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Swap it with another one.
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Old 11-06-2002, 11:11 AM   #3 (permalink)
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What & where is a MAP sensor???? could it be a cause of hesitation?
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Old 11-06-2002, 03:57 PM   #4 (permalink)
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The MAP sensor sits in the black box on the passager side of the firewall. It could, in theory cause hesitation. Where in the RPM band does your car hesitate?
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Old 11-07-2002, 11:59 AM   #5 (permalink)
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Its like clock work. It misses at exactly 1500 & 1750 & 2000 RPMs in any gear. In 1st it jerks ya like crazy if you don't keep revs over 2k. IF I'm EXTREMELY light on the gas, if makes it thru there smooth. Above that, It runs like a champ.


just looked it up: MAP = Manifold Absolute Pressure sensor.
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Last edited by Kbulls91Lude; 11-07-2002 at 09:00 PM.
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Old 11-07-2002, 03:44 PM   #6 (permalink)
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Quote:
Originally posted by Kbulls91Lude
Its like clock work. It misses at exactly 1500 & 1750 & 2000 RPMs in any gear. In 1st it jerks ya like crazy if you don't keep revs over 2k. IF I'm EXTREMELY light on the gas, if makes it thru there smooth. Above that, It runs like a champ.
My 1st gear is really jerky too if i don't keep a light foot on it. Is this normal or is something wrong?
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Old 11-09-2002, 02:05 AM   #7 (permalink)
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To follow up on the hesitation problem, and if you think it might be a MAP Sensor component, check out your symptoms here and for other possible sensors that can cause hesitation:

http://www.freeautoadvice.com/art/sensors.html
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Old 12-17-2002, 06:50 PM   #8 (permalink)
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The new wires & distrib cap solved the problem. EXCELLENT.!!!!
She's runnin smooth as can be.
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Old 12-18-2002, 03:17 AM   #9 (permalink)
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Quote:
Originally posted by redliner
The MAP sensor sits in the black box on the passager side of the firewall. It could, in theory cause hesitation. Where in the RPM band does your car hesitate?
I thought the MAP sensor sat in the intake plenume . . . . It measures the absolute air pressure in the intake manifold.
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Old 12-18-2002, 06:33 AM   #10 (permalink)
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On the Prelude, the MAP is only on the TB/manifold for '93+ VTEC motors. I believe the F22 and H23 has it mounted on the firewall.
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Old 12-18-2002, 09:44 AM   #11 (permalink)
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The MAP sensor on a 91 is in the black box thats mounted on the passenger side firewall & has the vacuum lines running into it.
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Old 12-18-2002, 09:52 AM   #12 (permalink)
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To add/clarify, as redliner said... it's the same for ALL 3g PGM-FI motors.
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Old 01-15-2003, 07:12 PM   #13 (permalink)
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Quote:
Originally posted by Kbulls91Lude
The new wires & distrib cap solved the problem. EXCELLENT.!!!!
She's runnin smooth as can be.
Nope, it's doing it again, It gradually came back. WHAT THE HELL? It was OK for a while.

A machanic friend thinks it could be an intake leak. He said to spray some carb cleaner down around the injectors and intake gasket & see if the idle speeds up at all. If that were the case, wouldn't it do it at all RPMs? Is this wise while its running?
It idles smooth all the time & runs strong over 3k rpms.
The problem is a LOAD issue. If I push any harder than a granny, it sputters its way up to 3k then opens up. And thats in any gear.

BUT, it DOESN'T do it when the engine is still cold. If I start it & take right off, its fine...for a couple blocks.

Any ideas?
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Last edited by Kbulls91Lude; 01-15-2003 at 07:32 PM.
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Old 01-15-2003, 08:39 PM   #14 (permalink)
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I've never thought it wise to spray flammable liquid at a running engine, but mechanics do some dumb **** sometimes. Usually the really stupid ones get themselves killed.

If you had a vacuum leak you would have a fast idle and it wouldn't affect anything else (just idle speed). The problem you have is obviously fuel or spark related, and from the sound of it, is in the control loop.

I'd try another MAP if you can. If not, check all the wiring associated with it and the distributor and cam sensor and make sure they are OK. No check engine light?
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Old 01-16-2003, 09:07 AM   #15 (permalink)
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No Check Engine light. if sensor related, i'd expect one.
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Old 01-16-2003, 10:25 AM   #16 (permalink)
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Not necessarily. O2 sensors can be hideously fouled and work improperly w/o errors. The TPS sensor and MAP sensor can be the same way for certain failure modes as well.

No check engine light just means that the failure mode results in "operable" parameters... always the hardest to troubleshoot.
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Old 01-16-2003, 06:29 PM   #17 (permalink)
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I'll put O2 sensors on my list
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Old 01-16-2003, 07:53 PM   #18 (permalink)
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Is the problem throttle position dependant? If so it might be the throttle position sensor. If the ECU thinks you're off the throttle at that moment it might be shutting down the injectors so you get the hesitation.
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Old 01-17-2003, 10:52 AM   #19 (permalink)
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No, not tps dependant, more of a load dependant situation. Going up a hill it has problems unless I downshift to keep revs over 3K.
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Old 01-27-2003, 12:35 PM   #20 (permalink)
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When was the last time you changed your fuel filter?
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