This is a discussion on Frost? within the Computer & Tuning forums, part of the LSx Technical Help Section category; Originally Posted by Frost If you have the TechII, get a running scan. If it is high, the fuel trimming ...
09-28-2009, 05:18 PM #21
09-29-2009, 09:33 AM #22
Well.....update! We sprayed down the entire engine with starting fluid to look for vaccum leaks and found none. Double checking every vaccum line...they look good. Haven't been able to get the tech 2 yet but hopefully since we are lost without it
09-29-2009, 11:29 AM #23
It needs to be fully tuned with a wideband sooner or later anyway, and the tuner will be able to pinpoint your problem (assuming he's not a hack), so...
10-02-2009, 11:50 AM #24
Well, no vacuum leaks. Double checked every connection and sprayed down with starting fluid and had no issues. Still haven't gotten the Tech 2 but hopefully soon. We did do a full throttle plug pull and it was as white as rice so no more driving it til we figure it out. Looking for a tuner around my area to take a look too.
10-07-2009, 04:03 PM #25
Car gets scanned by Tech 2 on Monday.....got a appointment One step closer to geting her running tip top
10-08-2009, 05:53 AM #26
10-08-2009, 10:57 AM #27
- Join Date
- May 2009
- 2002 SS
Do yourself a favor and save yourself time. go buy a wideband o2 setup and weld in a bung and see wth is happening !
10-08-2009, 09:24 PM #28
- Join Date
- Sep 2007
- hagerstown, mercersburg
black trans am
what if he melts the o2 wire its self... i know on the driver side its a pain in the as keeping it off the header
10-08-2009, 09:39 PM #29
A TechII can be less-than-useful for a car with these type of mods unless you really know what you are looking at. Even then, it's not a tuning tool.
A tuner can make short work of issues like this in person.
10-09-2009, 12:01 AM #30
10-13-2009, 09:03 AM #31
Well, its been scanned. The Injector pulse is off a big amount, all sensors checked out and triple checked for vaccum leaks which there is none. So now, no more guessing......it needs a dyno tune. So I thought long and hard and just going to have LS1speed do it next spring so maybe I can get mods ^ above done and make it just a lil bit faster yet....
10-13-2009, 10:14 AM #32
Injectors are dynamic. In order to know what they SHOULD be, there are about 20 prior variables that have to be crunched to determine final fueling. Further, once the car is in closed loop, IT is in control of the fueling. If it is wrong at that point, it's in the data going to the PCM (from the sensors!). Post all of the injector data details that the shop provided so we can see them; it's a most dubious assertion.
There is only one acceptable check for vacuum leaks on these cars (spraying cleaner and listening for idle changes doesn't work on a car with closed loop air and fuel controls), how did they perform it for you?
Though I don't doubt it needs tuning, I have tuned that cam many many times. I understand that you are frustrated, but being lean does not kill O2s, and a properly operating car corrects lean spots as part of closed loop. 131 and 151 are not tune related. If your car worked right, when it went into closed loop it would correct itself based on feedback from those sensors. A failing MAF (or one coated in K&N oil) that reports extremely low but doesn't code, wiring problems to the O2s (or bad O2s), misfires, large intake or exhaust leaks cause these codes. I have fixed these codes on dozens and dozens of local cars, and you can bet that the answer is on the list I made just above.
Post up some details related to the tests that you had done on the car, maybe there is something else to see that was missed. It's very likely since someone told you that the 'injector pulse was off'.
10-13-2009, 10:23 AM #33
10-13-2009, 10:34 AM #34
It sucks I can't give you anymore info from the scanner. Its impossible for you to try to figure it out with what little information I have at my disposal. I will just fill er up, put some sta-bil in and put it on jackstands til I can get it to a tuner around my area with a dyno. And......after some more mods I appreciate all the suggestions you have swung my way
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