FiTech EFI Tuning Forum

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Acceptable fuel pressure range?

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I have the IAC set by original instructions (only front). I'm thinking about adjusting it again by the new instructions (adjust rear as well) to see if it makes a difference. I would like to get rid of the rich condition to see if that makes the problem go away. It looks like I'm also currently getting just horrible mileage, so getting rid of the rich spots might help with that as well.

On thing to check, is to see if your throttle position sensor is working or your linkage is binding. With the engine off, turn ignition to the on position. On your handheld go to dashboard and look at TPS. While looking at TPS, press the gas pedal all the way to the floor an back to see what kind of TPS values you get. It should be at 0 when off the pedal and about 100 when flooring it. This will tell you if there is issues with the TPS sensor, linkage, or TBU shaft.

And yes IAC should be set using the front and back screws.

I checked the TPS after first installing the unit, and it read correctly. Pedal was way too hard to press for daily driving, so I then had to change the throttle cable into the large hole at the highest point on the lever. After that I re-checked the TPS and it looks like my pedal is running out of travel, as the highest TPS I get is around 90-91%. It's fine for now, since the pedal feel is much nicer, and I'm not going to need or use the last 10% in street anyway.

I'll get back to you after I get the IAC adjusted correctly. It might take a few days since I caught some nasty bug during weekend, and are not in a working condition right now.  Thank you for all the help and tips you have given so far!

Well, this turned out to be one heck of a shit show. When I got the IAC re-adjusted, the car started leaking oil so much I couldn't even drive it, and it took me whopping two months to get the oil leak fixed. Now, it seems that the exhaust is also leaking on the side where the O2 sensor is, so that's probably affecting the situation when I ease of the gas pedal. I try to get that fixed next, and continue testing and logging the engine behavior. I just don't know how much I can get done before the winter hits the town, and I have to park the car for next 6 months or so.

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