Alright this is an issue that haas been driving me absolutely crazy for a while now. For starters I did a top swap on my 01 gt a few months ago. Shortly after the install I began having a stalling problem. The car would stall out on me at cruising speeds around 50 or so. However I never had an issue with it if I were to get on it, it only happens when I am at part throttle. Really just enough to keep it up to speed. I had no codes and no ses light. Whenever the car would stall it would like just fall on its face and the rpms would drop down to and idle and then after a few secs. it will stall out. Whenever it does stall it takes some persuasion to fire back up. I have so far replaced the fuel filter, fuel pump, fuel pump relay, main ign relay, fpr, cps, maf, and the map. As well as repeatedly verified that there is no vacuum leaks and I cannot find any shorted out wires whatsoever. When I had it hooked up to a scanners, it flashed a p0101 code at the time of stalling. I really need this thing fixed I have been living with this condition for months now and I am going crazy here. Could it possibly be an iac? Any ideas or input would be greatly appreciated. Thank in advance.

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Top Swap, 3.2, P.P.'d Blower, 4" FWI, 103's, polys, 180*, ported N*, LQ4, C.C. S&S Headers, Full Size I/C, HPTuners, FP Hotwire, custom 2.5, 10k Hid's, angel eyes, SS Grilles, blk headlights & corners, avs, tinted tails, custom headliner, aeroforce

P0101 Mass or Volume Air flow Circuit Range/Performance Problem

replace the mass airflow sensor, see if that fixes it.

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'05 WRX STi - COBB Stage 2|Invidia DP|3" Borla XR-1|Coilovers|Camber Plates|Swaybars|Endlinks|Bushings|Braces|Anti Lift Kit|DBA4000s|SS lines|
Sold: 06 Cobalt SS/SC, 99 GTP 245WHP/326 Ft-lbs, 06 R6

This is what I came up with searching for the P0101 trouble code.
http://www.obd-codes.com/p0101

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1999 GT|SLP CAI|Borla Catback| Shift kit|18" Koblenz|GMPP Lowering|GMPP handling|Blk Headlights|ER Rcokers|HV3|HV TB http://www.fquick.com/The_Guz

He already replaced the MAF.

Try just unplugging the MAF and see what happens. maybe it's the plug/wiring?

When I unplug the maf it runs slightly worse than before and it seems to stall at a slower speed. Yeah I did replace the maf with another lq4.

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Top Swap, 3.2, P.P.'d Blower, 4" FWI, 103's, polys, 180*, ported N*, LQ4, C.C. S&S Headers, Full Size I/C, HPTuners, FP Hotwire, custom 2.5, 10k Hid's, angel eyes, SS Grilles, blk headlights & corners, avs, tinted tails, custom headliner, aeroforce

Alright so I am on my way home from work last night which is literally like less than 2 miles and it stalls out again as I pull on to my street. And now it is tripping three codes! p0101, p0107, and p1107! Still no check engine light though I read these off of my scan gauge. I already checked the wiring I suppose I will again. The maf and map are both new also. Any indeas/tips?

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Top Swap, 3.2, P.P.'d Blower, 4" FWI, 103's, polys, 180*, ported N*, LQ4, C.C. S&S Headers, Full Size I/C, HPTuners, FP Hotwire, custom 2.5, 10k Hid's, angel eyes, SS Grilles, blk headlights & corners, avs, tinted tails, custom headliner, aeroforce

try another PCM.

from my service manual for grand prix's

P1107 - MAP Sensor Voltage Intermittantly Low

P0107 - Manifold Absolute Pressure/Barometric Pressure Circuit Low Input

P0101 Mass or Volume Air Flow Circuit Range/Performance Problem




so try replacing the map sensor instead.

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'05 WRX STi - COBB Stage 2|Invidia DP|3" Borla XR-1|Coilovers|Camber Plates|Swaybars|Endlinks|Bushings|Braces|Anti Lift Kit|DBA4000s|SS lines|
Sold: 06 Cobalt SS/SC, 99 GTP 245WHP/326 Ft-lbs, 06 R6

He already changed the MAP Kyle.

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'02 Galaxy Silver GTX Coupe. SLP Headers, SLP cat-back exhaust, SLP 1.8 RR, ZZP 3.4/3.25" MPS, SLP hood, SLP CAI, Overkill PCM, 180 t-stat, SSIC, S1 TB, AL 104's, F/R STB's, F-body calipers.

someitmes a new sensor can be bad. or its not wired corractly, or the pcm was improperly written.

just making stabs in the dark here guys.

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'05 WRX STi - COBB Stage 2|Invidia DP|3" Borla XR-1|Coilovers|Camber Plates|Swaybars|Endlinks|Bushings|Braces|Anti Lift Kit|DBA4000s|SS lines|
Sold: 06 Cobalt SS/SC, 99 GTP 245WHP/326 Ft-lbs, 06 R6

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Alright so after worl last night I completely went over the wiring in the car. There are no shorts and I was unable to find an open circuit. I traced everything from the sensors themselves all the way to the pcm. I checked the map, maf, coolant temp, tps, iac and 02. Aswell as any other harnes or plug I could find. All seem fine. I checked for the 5v ref. wire at the sensors and all was looking good. The grounds were good. And the map was putting out 2.4v out the signal wire when key on and car off and I checked and made sure it was getting down the pcm. I rerouted the map extenstion harness so that it was not by the ignition wires. When I metered the referance wire at the pcm and applied vac. it did respond. When the car was running at idle the volts dropped to .8/.9v and would vary with engine speed. I did notice however that the larger or the right side fuel line was a little wet and if you jiggle it in and out and side to side fuel drips out of the quick connector. Is there a way to replace the o-rings inside the nylon fuel lines? If dont really touch then it doesnt leak and it doesnt spew or either. Regardless I am definately gonna replace the o-rings on the line if I could. For now I zipped the fuel line to the main vac. line for the brake booster and it kinda kept pulled in the fuel rail when I pushed the vac. line back on the blower,if that makes sense. Could it be possible for this to be the culprit? I realize its sorta a strech. Either way is there somethin I should know about replacing the o-rings?

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Top Swap, 3.2, P.P.'d Blower, 4" FWI, 103's, polys, 180*, ported N*, LQ4, C.C. S&S Headers, Full Size I/C, HPTuners, FP Hotwire, custom 2.5, 10k Hid's, angel eyes, SS Grilles, blk headlights & corners, avs, tinted tails, custom headliner, aeroforce

You can replace the o-rings on the fuel lines. I have done it and I have some extra o-rings from that. They are viton o-rings made for fuel. After doing my intercooler one of the o-rings had a knick in it and was dripping like yours. I also had a supercharger gasket leak after the install so I can not say which one affected my car worse.

You just need a pick tool and a steady hand. There is a guy named "shaveradam" over at clubgp that has fuel line kits made up and ready to sell. He has the return line, sending line, and injector o-rings all ready to go at a fairly decent price.

If you just wanted a return line and sending line o-ring. Drop me a PM with your address.

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'02 Galaxy Silver GTX Coupe. SLP Headers, SLP cat-back exhaust, SLP 1.8 RR, ZZP 3.4/3.25" MPS, SLP hood, SLP CAI, Overkill PCM, 180 t-stat, SSIC, S1 TB, AL 104's, F/R STB's, F-body calipers.

i could use a pair of those too, i replaced my injector o-rings, but the fuel ling orings have yet to be replaced.

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'05 WRX STi - COBB Stage 2|Invidia DP|3" Borla XR-1|Coilovers|Camber Plates|Swaybars|Endlinks|Bushings|Braces|Anti Lift Kit|DBA4000s|SS lines|
Sold: 06 Cobalt SS/SC, 99 GTP 245WHP/326 Ft-lbs, 06 R6

Send me a PM Kyle.

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'02 Galaxy Silver GTX Coupe. SLP Headers, SLP cat-back exhaust, SLP 1.8 RR, ZZP 3.4/3.25" MPS, SLP hood, SLP CAI, Overkill PCM, 180 t-stat, SSIC, S1 TB, AL 104's, F/R STB's, F-body calipers.

It could be a faulty sensor and YES it could happen several times in a row...
The SAME code kept coming up each time..

I'm on my 3rd sensor on the '00 Impala LS in a matter of 4 weeks...This last one seems to be working (for now!!! .....knock on wood )

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Alright so I replaced the o-rings and it is still stalling out on me. The last time that it stalled I checked out my scangauge and under map kpa it read like 102 kpa with the key on and egine off. I turned the key off and back on again and it read the same. It is supposed to read 40kpa with the key on engine off. And when I tried to start it, it refused to fire up. Then I unplugged the map and it fired right up. The map sensor is about a month or two old from autozone, I ordered another one and it should be in today. Any other ideas as to why it would read like this? Besides a bad map?

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Top Swap, 3.2, P.P.'d Blower, 4" FWI, 103's, polys, 180*, ported N*, LQ4, C.C. S&S Headers, Full Size I/C, HPTuners, FP Hotwire, custom 2.5, 10k Hid's, angel eyes, SS Grilles, blk headlights & corners, avs, tinted tails, custom headliner, aeroforce

102kpa is like what youd see under boost.

the wiring for the MAP sensor may be bad, clean the connections and stuff wen you install the new one today.

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'05 WRX STi - COBB Stage 2|Invidia DP|3" Borla XR-1|Coilovers|Camber Plates|Swaybars|Endlinks|Bushings|Braces|Anti Lift Kit|DBA4000s|SS lines|
Sold: 06 Cobalt SS/SC, 99 GTP 245WHP/326 Ft-lbs, 06 R6

I checked over the wiring once before. I traced the map and th maf all the way down to the pcm an I could not find anything wrong with any of them. All the grounds seem to be fine as well. I replaced the sensor tonight and the thing stalled out on me again! Would it have to be the wiring then? what else is there? Every time it stalls it trip a p0101 code which implies either a bad maf or map both of which have been replaced. Possibly the wiring? I know I thoroughly checked the wiring before. Perhaps I overlooked something?

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Top Swap, 3.2, P.P.'d Blower, 4" FWI, 103's, polys, 180*, ported N*, LQ4, C.C. S&S Headers, Full Size I/C, HPTuners, FP Hotwire, custom 2.5, 10k Hid's, angel eyes, SS Grilles, blk headlights & corners, avs, tinted tails, custom headliner, aeroforce

yeah man i dont see what else it could be except the wiring. by change have you wrote to the pcm? mayeb do a complete re-write to make sure everything is in order there too.

all shots in the dark, but youre running out of places to check, lol.

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'05 WRX STi - COBB Stage 2|Invidia DP|3" Borla XR-1|Coilovers|Camber Plates|Swaybars|Endlinks|Bushings|Braces|Anti Lift Kit|DBA4000s|SS lines|
Sold: 06 Cobalt SS/SC, 99 GTP 245WHP/326 Ft-lbs, 06 R6

Tell me about it, I am almost at a loss. I am not very experianced when it comes to tuning. What would I need in order to do a full re-write? How would I even get it?

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Top Swap, 3.2, P.P.'d Blower, 4" FWI, 103's, polys, 180*, ported N*, LQ4, C.C. S&S Headers, Full Size I/C, HPTuners, FP Hotwire, custom 2.5, 10k Hid's, angel eyes, SS Grilles, blk headlights & corners, avs, tinted tails, custom headliner, aeroforce

ask whoever did your tune to re-write the same tune to the pcm, but check it over first to make sure everythign is in proper order.

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'05 WRX STi - COBB Stage 2|Invidia DP|3" Borla XR-1|Coilovers|Camber Plates|Swaybars|Endlinks|Bushings|Braces|Anti Lift Kit|DBA4000s|SS lines|
Sold: 06 Cobalt SS/SC, 99 GTP 245WHP/326 Ft-lbs, 06 R6

Alright so I tested the wiring again. I was getting like 0.8 ohms resistence from the signal wire when I probe at the back of the sensor and at the corresponding pin at the pcm. I was getting a funny reading when I probed the ground and the reference wire. I got a reading of like 1.4-1.5ohm on them when I first tested. Then I exposed the wiring all the way down to the pcm. When I did this I was only getting a reading of like 0.8ohm as well on both of them. But when I would wiggle the entire harness I had it jump up to like 1 ohm on the ground. I grabbed the three and thoroughly inspected them all and I could not really find anything except one small cut in the ground wire but it looked pretty fresh like I may have just done it when I was cutting the tape I put on from the last time I inspected the wiring. There were like maybe two broken strands on the wire itself. So what I decided to do was reroute the entire harness. I ran all new three wires and ran them up the drivers strut tower and along the firewall away from the egr and to the map. I wanted to completely eliminate any possibility of interference. Everything is taped up very well and split loomed. All the connections are soldered and replaced with 18awg spooled wire from work. When I went to pull it outside I saw that we totaly got dumped on with snow so I couldnt really try and see if that fixed the problem or not.

Alright well that was not it. It stalled out on me again today! WTF! What should I do? What else can it be? Maybe a pcm? Is it possible that it is my tune? I really hope that it is not my pcm, because I purchased the credits from hptuners for this pcm. So if I replace it then I will be out a hundred bucks on top of the new pcm. What else could it be? I am honestly ready to just give up on this car. I cannot tell you how frustrating this all has been for me. What should I do next?

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Top Swap, 3.2, P.P.'d Blower, 4" FWI, 103's, polys, 180*, ported N*, LQ4, C.C. S&S Headers, Full Size I/C, HPTuners, FP Hotwire, custom 2.5, 10k Hid's, angel eyes, SS Grilles, blk headlights & corners, avs, tinted tails, custom headliner, aeroforce

im sure you have, but have you tried rewriting the pcm?

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'05 WRX STi - COBB Stage 2|Invidia DP|3" Borla XR-1|Coilovers|Camber Plates|Swaybars|Endlinks|Bushings|Braces|Anti Lift Kit|DBA4000s|SS lines|
Sold: 06 Cobalt SS/SC, 99 GTP 245WHP/326 Ft-lbs, 06 R6

Do you think that could be the problem? I had a buddy take a look at it but he is still kinda a newb too. He didnt really change much form zzp's tune on it. He pretty much just added a little fuel and some spark. I am still getting a p0101 code.

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Top Swap, 3.2, P.P.'d Blower, 4" FWI, 103's, polys, 180*, ported N*, LQ4, C.C. S&S Headers, Full Size I/C, HPTuners, FP Hotwire, custom 2.5, 10k Hid's, angel eyes, SS Grilles, blk headlights & corners, avs, tinted tails, custom headliner, aeroforce

rewrite ti with the stock zzp bin or even a stock bin (with yours saved to be written back at a leter time of course) and see if that makes a difference? running out of options..

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'05 WRX STi - COBB Stage 2|Invidia DP|3" Borla XR-1|Coilovers|Camber Plates|Swaybars|Endlinks|Bushings|Braces|Anti Lift Kit|DBA4000s|SS lines|
Sold: 06 Cobalt SS/SC, 99 GTP 245WHP/326 Ft-lbs, 06 R6