HadesOmega
20+ Year Contributor
- 640
- 12
- Aug 5, 2002
-
408,
California
I usually just drive my car around town or go from one city to another but I recently drove my car out to to someplace that was about 100 miles away. I have an autometer narrowband AF ratio gauge and I've noticed that when cruising at 70 around 3k RPM in open loop it will swing to the lower stoichiometric area and back down on fairly flat freeway. But I've noticed that after a lot of driving like 20-30 miles it won't be be showing anything at all as in very lean. My car has always been overheating (not very bad but will almost got 3/4) going up hills for some reason and when it was very cold it will run warmer (presumably from the denser O2) and even leaner in cruise. Is this normal? I think these two problems are related.
On hills I notice that it does not go into open loop mode and start dumping fuel in. I know my 95RS would do that, I had the same gauge installed in it. When I go WOT it gets enough fuel, it usually in the green or orange range, I know I narrowband isn't good for WOT tuning. However the car doesn't seem to be running poorly it runs fine.
Here's is some info on my car:
98 GST, 215k miles
running about 20lbs psi on s16G turbo
FMIC
190 pump rewired
EVO 9 560cc injectors
SAFC tuned with pocket logger- global is about -20%, I've tuned it for 1kRPM and 3KRPM to get the fuel trims as close as possible.
So my guesses it could be a couple things:
Bad ecu
vacuum leak
gauge could be going bad
SAFC tuning
Bad O2 sensor? It seems very responsive though...
etc...
Any ideas? Also the car did pass its last smog check couple weeks ago, if that makes any difference.
On hills I notice that it does not go into open loop mode and start dumping fuel in. I know my 95RS would do that, I had the same gauge installed in it. When I go WOT it gets enough fuel, it usually in the green or orange range, I know I narrowband isn't good for WOT tuning. However the car doesn't seem to be running poorly it runs fine.
Here's is some info on my car:
98 GST, 215k miles
running about 20lbs psi on s16G turbo
FMIC
190 pump rewired
EVO 9 560cc injectors
SAFC tuned with pocket logger- global is about -20%, I've tuned it for 1kRPM and 3KRPM to get the fuel trims as close as possible.
So my guesses it could be a couple things:
Bad ecu
vacuum leak
gauge could be going bad
SAFC tuning
Bad O2 sensor? It seems very responsive though...
etc...
Any ideas? Also the car did pass its last smog check couple weeks ago, if that makes any difference.
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