Please help: FP reading
#16
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Hmm, I have the lindsey racing adjustable fuel pressure regulator and I set it to 3 bar at idle. So I'm guessing that the fuel pressure is rising even higher under boost, correct?
So now I'll have to start the car and remove the vacuum line to see what it actually rises to?
So now I'll have to start the car and remove the vacuum line to see what it actually rises to?
#17
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If revving the engine in place, the chances are that you are not making any boost.
Have you checked the vacuum/pressure line from the manifold to the regulator? If it's leaking under pressure, the fuel pressure will not increase correctly with boost causing a lean condition.
If you are experiencing a lean condition only under WOT and your fuel pressure is fine, I would look at:
- the TPS & KLR. If the DME is not getting the Full Load signal, it will run under the Part Throttle maps, which are leaner than the WOT maps. This can be tested, but it's a bit more involved than checking the fuel pressure.
- Engine Temp sensor - If it's sending the incorrect signal to the DME, the DME will alter the fuel delivery incorrectly.
- Of course AFR readings depend on the instrument you are using to read the AFR. Are the readings correct?
- AFM is sending the incorrect signal to the DME.
#18
Burning Brakes
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Thanks guys.
John, Yes I'm reving the engine in place. My fuel gauge is on the rail.My boost Gauge shows me average off 18HG, and sometimes goes up to 24 when I'm cruising in gear. The TPS was replaced 9 months ago and at some point I removed the connector from it and I got the fault code at the test port. I think the Engine temp sensor it's also fine since it makes it rich at start up with an AFR ~10. I'm running a MAF. I wish I had the money now to buy one of your systems. I think I need to shop for a good cheap DME.
John, Yes I'm reving the engine in place. My fuel gauge is on the rail.My boost Gauge shows me average off 18HG, and sometimes goes up to 24 when I'm cruising in gear. The TPS was replaced 9 months ago and at some point I removed the connector from it and I got the fault code at the test port. I think the Engine temp sensor it's also fine since it makes it rich at start up with an AFR ~10. I'm running a MAF. I wish I had the money now to buy one of your systems. I think I need to shop for a good cheap DME.
#19
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Revving the engine in place is not going to raise boost nor the fuel pressure over 2.5bar. Check all possible causes, don't assume a part is good because it's not old.
Have you cleaned the MAF recently? If it's contaminated, more than likely with oil, it will not read correctly.
Have you cleaned the MAF recently? If it's contaminated, more than likely with oil, it will not read correctly.
#20
Burning Brakes
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Hi good news. I got the chips that I requested from someone. One of the maps is almost right on. Thanks everybody for trying to help. I really don't want to badmouth Autothority but I will never buy another product from them.
John thank you.
John thank you.
#22
Burning Brakes
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OOps next thing might be the Fuel Pump.
Rennlisters rule.
Russell Berry. Thank you.