Goddamn Surging Idle.. Again
04-09-2004, 09:20 AM
#31
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Join Date: Feb 2002
Location: Frederick MD
Posts: 6,331
Originally Posted by 93 R1' date='Apr 9 2004, 06:24 AM
Maybe your TPS is fucked up.
Go to the sensor screen and push the gas slowly to the floor. The TPS voltage should gradually/smoothly change as you press the gas.
Search around for the proper specs of the voltage signal.
Go to the sensor screen and push the gas slowly to the floor. The TPS voltage should gradually/smoothly change as you press the gas.
Search around for the proper specs of the voltage signal.
04-09-2004, 10:55 AM
#32
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Join Date: Nov 2002
Posts: 127
Well, after finally seeing Justin's car I just have to say I cannot believe he hasn't killed someone yet. The car is beautiful inside and out and short of a few hundred gremlins is one of the best examples of a 3rd gen I have ever seen. It must be a lot like dating a supermodel who doesn't like to kiss 
The surging is as big a problem as I have ever encountered. It is identical to a MAP sensor issue EXCEPT that the map sensor seems to work above idle. In other words, at idle the sensor output seems like a flatline, under throttle however, the sensor appears to behave somewhat normally.
Of course it could be the idle air control assy, or a bad throttle body, or a bad idle air bypass screw etc. etc. etc.
We did manage to retune for safety and driveability above idle, but no amount of messing with the idle cells (richer, leaner, timing etc) made a damn bit of difference. I am guessing a mechanical problem (including physcially screwed up sensors) somewhere. Any help or suggestions are appreciated.
The surging is as big a problem as I have ever encountered. It is identical to a MAP sensor issue EXCEPT that the map sensor seems to work above idle. In other words, at idle the sensor output seems like a flatline, under throttle however, the sensor appears to behave somewhat normally.
Of course it could be the idle air control assy, or a bad throttle body, or a bad idle air bypass screw etc. etc. etc.
We did manage to retune for safety and driveability above idle, but no amount of messing with the idle cells (richer, leaner, timing etc) made a damn bit of difference. I am guessing a mechanical problem (including physcially screwed up sensors) somewhere. Any help or suggestions are appreciated.
04-09-2004, 02:13 PM
#33
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Join Date: Dec 2001
Location: Panama City Beach, Florida
Posts: 993
Dude, just unplug ur ISC and tune your idle manually with the screws.. take the computer out of the equation.. make sure you don't have any leaks... cuz it sure sounds like a vacuum leak.. Cuz ur car can still pull good but idle like **** if there is a teeny tiny leak.. check all your injectors, LIM to engine, LIM to UIM, and all nipples.
04-09-2004, 02:27 PM
#34
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Join Date: May 2003
Location: Pensacola, FL
Posts: 124
Originally Posted by twinturborx7pete' date='Apr 8 2004, 01:21 PM
Trailerpark idle? Nah man, just means its CAMMED!!!
one of my friends liked his rotary to have a lumpy idle cuz it sounded cammed..lol
"that thing misfiring?" "that thing cammed?"
one of my friends liked his rotary to have a lumpy idle cuz it sounded cammed..lol
"that thing misfiring?" "that thing cammed?"
04-09-2004, 04:12 PM
#35
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Join Date: Feb 2002
Location: Frederick MD
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Originally Posted by twinturborx7pete' date='Apr 9 2004, 01:13 PM
Dude, just unplug ur ISC and tune your idle manually with the screws.. take the computer out of the equation.. make sure you don't have any leaks... cuz it sure sounds like a vacuum leak.. Cuz ur car can still pull good but idle like **** if there is a teeny tiny leak.. check all your injectors, LIM to engine, LIM to UIM, and all nipples.
I'm going to go back over the car for vacuum leaks.. But I'm not even sure where to look anymore. I actually HOPE I find one.
Jeff, thanks for the compliments! And again, thanks a bunch for all the help! Hopefully I can get this thing sorted out and we can see what this car can do.
04-10-2004, 06:55 PM
#39
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Join Date: Feb 2002
Location: Frederick MD
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Originally Posted by 93 R1' date='Apr 10 2004, 12:53 PM
easiest way to check a vac leak is with propane or smoke. If you use propane the car will idle higher once it sucks it in.