Stumbling, intermittent, power cutout.. SOLUTION!
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Former Moderator
Joined: Aug 2004
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Stumbling, intermittent, power cutout.. SOLUTION!
Look at XViper's post:
Nimesh, I just saw this thread. I hope that it is truly a MAP sensor but .............
Here's the story:
I've been advising a few guys by PMs over the last 6 months or so on this very issue. They ALL have newly installed Comptech superchargers. Some of these also came up with a "bad" MAP sensor and got it changed. Everything was fine for a little while and then the problem reproduced themselves again. In all of these cases, it was NOT a MAP issue. It was a Comptech ESM wiring connection issue. A couple of the connections had either worked themselves loose, corroded slightly or disconnected altogether. When the owners had the wiring double checked and securely soldered, the problem NEVER re-surfaced. Those poor connections made it "look" like it was a MAP issue.
Until you get a new MAP, if it should happen again, stop the car, turn off the engine and give your kick panel (where the ESM connections are) a few firm nudges - well, OK, give it a few good thumps. This will most likely shift the connections just enough to "fix" the problem. If this happens, then forget about the MAP sensor (except maybe do the new "zip tie" thing). Get the wiring re-checked.
Here's the story:
I've been advising a few guys by PMs over the last 6 months or so on this very issue. They ALL have newly installed Comptech superchargers. Some of these also came up with a "bad" MAP sensor and got it changed. Everything was fine for a little while and then the problem reproduced themselves again. In all of these cases, it was NOT a MAP issue. It was a Comptech ESM wiring connection issue. A couple of the connections had either worked themselves loose, corroded slightly or disconnected altogether. When the owners had the wiring double checked and securely soldered, the problem NEVER re-surfaced. Those poor connections made it "look" like it was a MAP issue.
Until you get a new MAP, if it should happen again, stop the car, turn off the engine and give your kick panel (where the ESM connections are) a few firm nudges - well, OK, give it a few good thumps. This will most likely shift the connections just enough to "fix" the problem. If this happens, then forget about the MAP sensor (except maybe do the new "zip tie" thing). Get the wiring re-checked.
Here's one on the Comptech ESM:
https://www.s2ki.com/forums/index.php?showt...0&#entry5328193
So I had MAP sensor-like problems, with the car stumbling a little, feeling like the ECU was retarding timing and fuel delivery.
When I would clean the MAP sensor or throttle body, the problem would markedly improve. But within a day or two, it'd be back to intermittent fuel and retardation. The plugs were fouling rapidly and the car overall ran rich.
So using the SEARCH function (hint, hint, noobies) and using the terms: "faulty MAP sensor" I came up with XViper describing 6 Comptech SC users with similar symptoms. With reconnecting the ESM wires, it solved their problems.
So I removed the kick panel and checked the wiring, one of the wires was loose.
Soldered it and car is running really, really well. Full power... I forgot how faaaaaast it could be.
So if you have a Comptech and the "MAP" problem, check the ESM to ECU behind the kick panel.
For people that bought used vehicles, maybe check to see that an ESM wasn't left behind on a previous Comptech installation.
And for people who bought used Comptech systems, make sure they included the ESM in the kit or else your MAP will see full boost and not run smooth.
Hopefully, this is a durable solution... will keep updated.
Former Moderator
Joined: Jul 2001
Posts: 8,821
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From: Jacksonville, FL
I will check mine this weekend. Have that same problem...replaced the MAP, cleaned the TB including the passage to the MAP, changed the IAC, and was about to swap out the coil packs.
Very possible a connection has gone bad since I've got a boomslang harness for a VAFC.
Very possible a connection has gone bad since I've got a boomslang harness for a VAFC.
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