1984grandnat
Member
- Joined
- Oct 28, 2001
Well, I've been pondering this for months now...just thought I'd see what you guys (and gals) think.
Here's the situation:
I can't run the car at WOT at this point...anything over 5 psi will result in really bad sputtering (maybe just one cylinder--hard to tell), and then it knocks and falls on it's face. I have replaced the coil pack, plugs and wires. The car has new injectors, and plenty of fuel pressure (Walbro pump, hotwire, etc, etc...set at about 40 psi static). When I add race gas, the knock disappears, but the sputtering is still there (starts at about 5 psi). The TPS seems to have a good smooth sweep, and is set as close as I can get it. I have tried several chips, and they all do the same thing. It seems to me like there is not enough spark energy to fire the plugs under boost. That was my theory when I replaced the coil pack. My next question is: does the ignition module have anything to do with spark energy? ...or is the module simply providing proper "timing"? I also question the ECM...I have had several intermittent codes being set such as "wastegate pulses not detected" (even though the solenoid is new and the connection is good), and "TPS voltage too low" or "TPS voltage too high". If I go through the trouble to set the TPS, it will be fine for a short time (couple hours), and then when it sets a code and I check it again, it will be resting at like .08 volts, instead of .42 like I set it at. Then like magic, it will go back to normal again. Obviously, this is frustrating to say the least! I have checked and double-checked all the grounds and see nothing bad here. I should also mention that I had a bad voltage regulator in my alternator over the summer (which caused my lighting to flicker, and some voltage spikes), so this is another reason that I am questioning the ECM and module.
Maybe it's time to make a few purchases from Red Regal T...?
Well, sorry about the book...maybe I need to post more often and not let all this build up so much, huh?
Thanks for any input, ...I appreciate it all!
Here's the situation:
I can't run the car at WOT at this point...anything over 5 psi will result in really bad sputtering (maybe just one cylinder--hard to tell), and then it knocks and falls on it's face. I have replaced the coil pack, plugs and wires. The car has new injectors, and plenty of fuel pressure (Walbro pump, hotwire, etc, etc...set at about 40 psi static). When I add race gas, the knock disappears, but the sputtering is still there (starts at about 5 psi). The TPS seems to have a good smooth sweep, and is set as close as I can get it. I have tried several chips, and they all do the same thing. It seems to me like there is not enough spark energy to fire the plugs under boost. That was my theory when I replaced the coil pack. My next question is: does the ignition module have anything to do with spark energy? ...or is the module simply providing proper "timing"? I also question the ECM...I have had several intermittent codes being set such as "wastegate pulses not detected" (even though the solenoid is new and the connection is good), and "TPS voltage too low" or "TPS voltage too high". If I go through the trouble to set the TPS, it will be fine for a short time (couple hours), and then when it sets a code and I check it again, it will be resting at like .08 volts, instead of .42 like I set it at. Then like magic, it will go back to normal again. Obviously, this is frustrating to say the least! I have checked and double-checked all the grounds and see nothing bad here. I should also mention that I had a bad voltage regulator in my alternator over the summer (which caused my lighting to flicker, and some voltage spikes), so this is another reason that I am questioning the ECM and module.
Maybe it's time to make a few purchases from Red Regal T...?
Well, sorry about the book...maybe I need to post more often and not let all this build up so much, huh?
Thanks for any input, ...I appreciate it all!