MAP sensor stuck at 2.53V
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MAP sensor stuck at 2.53V
'90 351W EFI
Finally got around to checking my MAP sensor cause been running rough for a few months. I did the tests as outlined in Haynes. My voltage is stuck at 2.53V with keyon engine off. I apply vacuum to the sensor and it doesnt budge. I know some sensors need a tachometer and i got one on my voltmeter but its just gives readings way off from what Haynes says anyway so I assume mine is the voltage one.
This would explain why is runs crappy at low throttle, good at mid throttle and a bit crappy atreally high speeds. I think the measurements should be 5V at no vacuum then 1V or so at hight vacuum(20inHG)
Would also explain the 15MPG highway and 8MPG city maybe.
Do these things default somewhere in the middle when busted.?
Should I replace it?
Im still not sure this is the problem.
Finally got around to checking my MAP sensor cause been running rough for a few months. I did the tests as outlined in Haynes. My voltage is stuck at 2.53V with keyon engine off. I apply vacuum to the sensor and it doesnt budge. I know some sensors need a tachometer and i got one on my voltmeter but its just gives readings way off from what Haynes says anyway so I assume mine is the voltage one.
This would explain why is runs crappy at low throttle, good at mid throttle and a bit crappy atreally high speeds. I think the measurements should be 5V at no vacuum then 1V or so at hight vacuum(20inHG)
Would also explain the 15MPG highway and 8MPG city maybe.
Do these things default somewhere in the middle when busted.?
Should I replace it?
Im still not sure this is the problem.
Last edited by lattices2; Aug 21, 2005 at 01:06 PM. Reason: type
Thread Starter
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Senior User
Joined: Feb 2005
Posts: 124
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map
forget it. Its not the map sensor. The guy at the parts store actually let me hook up a new one!! And its the same response.
I still dont know why Haynes is wrong.
All i can think of is its a tach output and my tachometer sucks or im doing it wrong.
I still dont know why Haynes is wrong.
All i can think of is its a tach output and my tachometer sucks or im doing it wrong.
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