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Hey all:
Well its my 93 PGT again, my white whale. I've been trying to get it to idle right but just can't seem to do it. Right now, the car only idles in diagnostic mode but backfires like crazy otherwise. When I tried to set ignition timing, I've only been able to get it to 13-14 BTDC, otherwise it starts chugging (however it won't idle outside of diagnostic mode.)
Here's the low down:
Checked and fixed/changed:
1) Vacuum leaks:
- 90% sure I got them all including cracks in the intake hose (which I fixed using silicone sealer.)
- Made sure there aren't any leaks at the VRIS, and other hidden vac points (did smoke test to find leaks.)
2) Changed Spark Plugs, tested and verified wires are good.
3) New Fuel Filter
4) Recently replaced TPS and Knock Sensor, tuned TPS but may need to do it again now that I got the idle speed to be at a buttery 650-700 rpms.
5) Done HEI Mod with external coil, recently resealed MSD power tower on distributor cap with black silicone sealer.
6) Checked and verified that IAC is good.
7) Replaced Fuel Injectors from a j/y 2001 Mazda Millenia. They did pass the resistance test.
Problems:
1) Can't seem to get ignition timing. Timing more or less lingers at 13-14 BTDC, otherwise, car idles like piss in diag mode. However, if I set it where it idles right in diag mode, it backfires and dies in normal mode.
2) When cold, it takes a while for the car to start and when it does, the only way to get it to idle is to step on the gas pedal and slowly let off after it warms up a bit.
3) When the car is running with the gas pedal is pressed down, there's a lot of smoke and it smells like carbon/fuel. When it idles on its own, the smoke isn't as noticeable but the smell is still there.
Note: Right now there's less than a gallon of gas left so its possible that might be contributing to the issues. I will be filling the tank before I work on it next.
Does anybody have any ideas what the deal is? Have any of you run into any difficulties setting the ignition timing and have any tips on getting it right?
Also, is there a certain order when tuning the car as in do you set idle, tune TPS then set ignition timing or do you set ignition timing, tune TPS, then set idle or some other combo?
Thanks in advance!
Well its my 93 PGT again, my white whale. I've been trying to get it to idle right but just can't seem to do it. Right now, the car only idles in diagnostic mode but backfires like crazy otherwise. When I tried to set ignition timing, I've only been able to get it to 13-14 BTDC, otherwise it starts chugging (however it won't idle outside of diagnostic mode.)
Here's the low down:
Checked and fixed/changed:
1) Vacuum leaks:
- 90% sure I got them all including cracks in the intake hose (which I fixed using silicone sealer.)
- Made sure there aren't any leaks at the VRIS, and other hidden vac points (did smoke test to find leaks.)
2) Changed Spark Plugs, tested and verified wires are good.
3) New Fuel Filter
4) Recently replaced TPS and Knock Sensor, tuned TPS but may need to do it again now that I got the idle speed to be at a buttery 650-700 rpms.
5) Done HEI Mod with external coil, recently resealed MSD power tower on distributor cap with black silicone sealer.
6) Checked and verified that IAC is good.
7) Replaced Fuel Injectors from a j/y 2001 Mazda Millenia. They did pass the resistance test.
Problems:
1) Can't seem to get ignition timing. Timing more or less lingers at 13-14 BTDC, otherwise, car idles like piss in diag mode. However, if I set it where it idles right in diag mode, it backfires and dies in normal mode.
2) When cold, it takes a while for the car to start and when it does, the only way to get it to idle is to step on the gas pedal and slowly let off after it warms up a bit.
3) When the car is running with the gas pedal is pressed down, there's a lot of smoke and it smells like carbon/fuel. When it idles on its own, the smoke isn't as noticeable but the smell is still there.
Note: Right now there's less than a gallon of gas left so its possible that might be contributing to the issues. I will be filling the tank before I work on it next.
Does anybody have any ideas what the deal is? Have any of you run into any difficulties setting the ignition timing and have any tips on getting it right?
Also, is there a certain order when tuning the car as in do you set idle, tune TPS then set ignition timing or do you set ignition timing, tune TPS, then set idle or some other combo?
Thanks in advance!
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