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Old 09-13-2005, 08:59 PM   #1
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Turbo tuning / air charge temp sensor proplems? Need opinnions + help.

My tuning arrived with the sct xcalibrator2 for my turbo project. I datalogged a few runs on the stock maf and injectors just to see how that setup was running. Everything was fine. And then I swapped to the 80 mm 02 mustang gt maf anf 39 lb injectors. I wired in the external act sensor at this time as well. I then Uploaded the tune for the maf and injectors and It was running strong at idle. I drove the car around the block a few times with the datalogger on. The only thing that was strange to me was a high act sensor reading. And the maf voltage was slow to switch. But the car still drove pretty well. So i was just driving it and not getting in to the boost just to get back in my driveway.

I pulled up to a stop sign and the car wanted to die out. It was still running though so I started down the next block and towards the end the car let out 2 loud exhaust backfires and died out. I tried to crank it for like 30 seconds and it wouldn't start. After about 5 minutes of it sitting, the car started up again and I made it about half a block before It died out again. The only thing that really sucked is my laptop's battery ran out of power so I had no idea what was happening.

It took a good 45 minutes to let it cool down and then drive it in short spirts till I got it to my driveway. By that point I don't know if the battery was just drained, but it was cranking over strange. I plugged the laptop in to charge the battery and got to work under the hood. I pulled the spark plugs they were fine, and using a screw driver made sure I didn't bend or break any rods, and then I got out the compression tester and all 4 cylinders were fine. So i know nothing blew up in the motor. Then i went to the laptop and luckily the thing suspended itself so The last datalog was still showing and it revealed an act reading that would be roughly 340 degrees

I think my act sensor is either the wrong one for my aplication, or that it's defective, because 340 degrees seems out of whack. I think the computer was pulling so much timing based off that reading that the car wouldn't run. I've ordered an act sensor from a 99 mustang gt so that might fix it. I'll give that one a try later tonight.

What does everyone else think it might be?


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Old 09-14-2005, 12:46 AM   #2
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The plugs looked fine? not rich? Next time you take it out, take a plug wrench and some gloves and pull a plug after it dies. see what it looks like. Are you reading AFR ( lambda) with a O2?
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Old 09-14-2005, 12:48 AM   #3
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Also, you were not running out of stock injector??? How much boost?
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Old 09-14-2005, 07:23 AM   #4
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Look on your scan tool and watch the short turm fuel trims =STFT and make sure you are going into open loop after about 30 to 60 sec after start up , you cant watch the STFT if its not in closed loop

Also look for Vac leaks

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Old 09-14-2005, 01:49 PM   #5
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Thanks for the replies.

But This problem was something I caused.

The air charge temp sensor was reading wrong. I switched it and with the engine cold there was a 40 degree difference. The new sensor displayed readings that were close to the actual outside air. But the car would run sputter and die out even while giving it gas and could not stay running. But that sensor was not the problem.

So I thought about checking resistance in the crank and cam position sensors. I checked the cam sensor It was fine. Then I jacked the car up to check the crank sensor. I notice the wire from my tach driver was against the a/c pulley. It wore through and made the signal wires touch. I chopped out the bad section and repaired the wireing and the car ran perfectly.

When i was chaniging the injectors yesterday i dropped the fuel rail spacer and I removed a splash shield to retrieve it. When I put the shield back i must have accidently caught the tach driver wire. That is what caused this problem. Now everything is running fine.
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