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Stumbling problem

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BuckeyeTroop

Active Member
Joined
Aug 18, 2007
Messages
503
I replaced my extender chip that had 27* timing and required 110 octane or better with Eric's TT 93 chip and it doesn't feel like I lost much peformance at all, if any. My 02's are alittle lower at about 750 WOT and I get an occassional .5 knock for a brief second. My stock boost gauge is showing a max of 18-19 lbs after I adjusted the wastegate alittle still with no real knock. Great chip Eric.

UPDATE: Might have spoke too soon. Drove the car on the highway about 35 miles, ran fine. Made one stop for about 1/2 hr started it and as I started to pull out of the parking space it started stumbling bad. I limped it to an open area and it stalled. No MAL codes on the scanmaster. Tried to start it a couple times and it would turn over but then die. Let it sit for about 30 minutes, started up fine drove it home. As soon as I let off the gas for an exit it stumbled again and stalled. I repeated this the rest of the way home. When it would stall all I had to do was wait a couple minutes and start it back up until it stalled again from having to get off the gas for stopped cars or red lights. Any ideas.
 
Thanks for reply Eric. I just took it out for about 15 minutes. Started up fine and ran pretty good. Here's the numbers I got. I forgot to mention, when I was trying to get it home earlier and when it seemed to running decent, I went about half throttle and boost went to about 16 lbs but there was no power, it seemed to rev and then stalled.

Idle (warmed up) WOT

02's 530-620 792 zero knock
AF .05 226
TPS .36 4.52
IAC .00 98
L8 31 255
INT 128 128
BL 142 128
 
The high BLM at idle is telling us there is a problem. What version is your Translator? It should be written on the cover, like 5.2 or 6.2, something like that. What MAF do you have? What are the settings inside the Translator set to?

Eric
 
I'm running a stock MAF. My TPS was in that low range prior to the chip change and thats actually the highest i've noticed the BLM at idle. This last time out it ran strong with those numbers but I didn't think I was going to get it home today.
 
Sorry I made the assumption since you said you had an Extender chip in there before which requires a Translator to work properly.

I would look inside the MAF and see if the screen has come loose. Also make sure no vacuum hoses have come off, or any intercooler/intake hoses have come off.
 
Ok, thanks. I just reset my IAC for the first time and set my TPS at .42-.44 idle and 4.70-4.80 WOT. My BLM at idle is still alittle high at 138-142. All hoses are in place.
 
How many screens in the MAF? Did you look inside to see if it's still intact? How old is your O2 sensor, has it been used with leaded fuel?

Your old chip was made for 36lb injectors? What was the idle BLM with that chip?
 
How many screens in the MAF? Did you look inside to see if it's still intact? How old is your O2 sensor, has it been used with leaded fuel?

Your old chip was made for 36lb injectors? What was the idle BLM with that chip?

I have one screen in the MAF. I don't know the age of the 02 sensor but there was C16 in it when I bought it from Louie L while it was running the extender chip. I ran 1 tank of 110 prior to changing to your chip. My BLM was 128 with that chip.

I took it out for an hour today after making the TPS and IAC adjustments and it ran great. A few WOT and some stop and go with zero problems until the last red light before home and the RPM's dropped and it started stumbling again and stalled. Got it started and limped it home. The BLM is at 142 again.:confused:
 
Just to back up for a minute. The reason I posted this in the TTA tech section instead of contacting Eric direct is because I didn't think and still don't think it is a chip issue. After re-reading my post I could have chose my words differently. Eric is being alot of assistance right now with my issues.
 
Perform the "Tap Test' on the MAF.

Start engine.. while car is idling.. tap on the MAF like your knocking on a door.. if the car stumbles when you tap the MAF.. its going bad.

Buy a new AC Delco AFS20 O2 sensor.

Take a look at your plugs, as the C16 can make things ugly fast. Along with an improperly setup car. Your IAC and TPS.. with high BLM's means your tuneup was way out of whack. Let alone higher BLM's means its dropping in extra fuel which can contaminate the oil. So keep an eye on the oil as well.
 
At 18 PSI your AF should read 255 not 226.

And your O2's should not come down to 750. They should be higher at 780-800 but this assummes a good O2 sensor
 
Take a look at your plugs, as the C16 can make things ugly fast. Along with an improperly setup car. Your IAC and TPS.. with high BLM's means your tuneup was way out of whack. Let alone higher BLM's means its dropping in extra fuel which can contaminate the oil. So keep an eye on the oil as well.

Thanks for the info. My BLM's were steady 128 with the extender chip but the TPS was around .36 then also and today was the first time I adjusted the TPS and IAC.

What would cause it to run so well for 45 min to an hour each time and then all of a sudden start stalling? Thanks
 
The TPS and IAC don't necessarily have any effect on BLM, they just needed to be set up correctly.

I would say pop your old chip back in and drive it around a while to see how it acts, and see where the BLM ends up. If it does fine, then I'll swap the chip out with you and go from there.

Oh, like Julio said, definitely change the O2 if it had C16 run in there.
 
Ok, thanks Eric I appreciate it. Since the extender chip is a high timing chip and I don't plan on putting 110 in it again, do you want me to just check the BLM or run it around for awhile to see if the stumbling starts again. Thanks
 
Ok, thanks Eric I appreciate it. Since the extender chip is a high timing chip and I don't plan on putting 110 in it again, do you want me to just check the BLM or run it around for awhile to see if the stumbling starts again. Thanks


You can drive around the car normally with a race chip. Just dont go WOT. Your trying to diagnose a stumbling not WOT problem.

Again.. test the MAF, change the O2 and plugs.
 
Eric and Razor thanks for all the help. It might be a day or two before I can get it out again.
 
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