Scan Master Readings. Rough Idle Very rich

gidyuppp

Member
Joined
Jun 17, 2010
Ok, by popular request I purchased a scan master. Scenario is car was running great, all of a sudden it died. Ignition module installed and that got the car to turn over right away. Now car is running rough. I put in new AC Delco plugs. I had a new MAF and Coil pack as a back up and put those in. With the new MAF I was throwing a code on scan tool. With old MAF no code. Here are the results at idle 2750 RMS for as long as the car would stay running

o2 minivolts 203-800
AF-34
L8-54
Bat-13.2
int-128
bl-128
clt-206
ats-110
r-2750
tps-.96
iac-62
cc- 30-209

Any suggestions based on the numbers. No malfunction codes.
 
TPS is way high... you want .40 - .46.. .42 being the mean. I would address that first. Key on engine off.
 
According to the diagram I am pretty sure I did. Had a second set of eyes (mechanic, Not TR specialist but I trust him) How do I rule out the crank sensor?
 
CLT at 206 seems high for a modern chipo_O

Kevin

Mine runs fine at well above 206 with a new TT chip...stabilizes and runs great at 226F with the AC on in the Houston heat.

For what it's worth....I tried two brand new MAF sensors (repros as original style not available)...would barely run with either of them.
The car ran well and immediately responded to an LS1 MAF swap.

Did you undo the orane wire by the battery to make your ECM relearn the new TPS settings and MAF?
 
Mine runs fine at well above 206 with a new TT chip...stabilizes and runs great at 226F with the AC on in the Houston heat.

For what it's worth....I tried two brand new MAF sensors (repros as original style not available)...would barely run with either of them.
The car ran well and immediately responded to an LS1 MAF swap.

Did you undo the orane wire by the battery to make your ECM relearn the new TPS settings and MAF?
Thanks. Still rough idle. Exhaust smelling. Pulled plugs again and checked gap and all was fine there. When I put the car in reverse, while idling, it stalls right away. The battery was unplugged to reset. If the MAF was fine before the issue (Ignition Module which seemed to be replaced and now the car turns over) Is it recommended that I swithc to the LS1 MAF? If the car was running just fine before, will that make a difference now? Is the crank sensor my next option? Thanks
 
I thought you had put a new maf on...sounds like you went back to the old.

I highly recommend the Ls1 maf...dont buy a new one as there are many to be had at the junkyards...my car was already modified and i had an f-body maf for an ls1 so i just bought the translator and the difference was immediate.

It sounds like there may be other things going on with your car, i am still pretty new at this.
 
Hatdragracer said:
Mine runs fine at well above 206 with a new TT chip...stabilizes and runs great at 226F with the AC on in the Houston heat.

For what it's worth....I tried two brand new MAF sensors (repros as original style not available)...would barely run with either of them.
The car ran well and immediately responded to an LS1 MAF swap.

Did you undo the orane wire by the battery to make your ECM relearn the new TPS settings and MAF?

Why would you want your car to run at 226 degrees? That doesn't seem right.
 
I never said I wanted it to run there...on a hot day with the ac on that is where it stabilzed....i mention it because another poster said that 206 may cause it not to run.
 
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