Help me make my car reliable. End my misery.
#64
Elite Member
Thread Starter
iTrader: (9)
Join Date: Sep 2008
Location: Michigan
Posts: 5,609
Total Cats: 13
Well that's that. Since this is related to the reliability of the car I'll post it here and not in another thread. The car was driving fine till yesterday then once after going into boost the car is behaving erratically. Now every time the car hits boost is definitely leaner than before and I get a flutter sound similar to the hard spark/fuel cut and my AFR go a bit crazy. Also the car leans out bad once it's been driven.
#67
The actual log would have a lot more information than a screen shot. Can't really help you much with the limited information in the screen shot. It certainly doesn't seem like AFR's are going "crazy."
I would do a TPS calibration though. Are you saying you had it floored the whole time above and the TPS tapered off by itself? That would be strange, TPS's are usually pretty reliable.
I would do a TPS calibration though. Are you saying you had it floored the whole time above and the TPS tapered off by itself? That would be strange, TPS's are usually pretty reliable.
#68
Elite Member
Thread Starter
iTrader: (9)
Join Date: Sep 2008
Location: Michigan
Posts: 5,609
Total Cats: 13
The actual log would have a lot more information than a screen shot. Can't really help you much with the limited information in the screen shot. It certainly doesn't seem like AFR's are going "crazy."
I would do a TPS calibration though. Are you saying you had it floored the whole time above and the TPS tapered off by itself? That would be strange, TPS's are usually pretty reliable.
I would do a TPS calibration though. Are you saying you had it floored the whole time above and the TPS tapered off by itself? That would be strange, TPS's are usually pretty reliable.
log and tune are attached now
#69
Well, I looked at the log. Honestly, I don't see much wrong there. I see AFR going up to about 12.5:1, but a bit of tuning would take care of that. I don't see AFRs going "crazy," and I don't see anything that would cause rough running.
???
At 15psi, you've got enough boost to blow out your spark unless you've got a smaller gap or have COPs or LS coils. Assume you've taken steps to prevent spark blowout?
BTW, if you are concerned about AFR's going to 20:1+ when you let off the throttle, that behavior is normal. It's called "overrun cutoff" and is designed to cut fuel when you coast in gear. There's a dialogue in MS where you can adjust it or turn it off.
???
At 15psi, you've got enough boost to blow out your spark unless you've got a smaller gap or have COPs or LS coils. Assume you've taken steps to prevent spark blowout?
BTW, if you are concerned about AFR's going to 20:1+ when you let off the throttle, that behavior is normal. It's called "overrun cutoff" and is designed to cut fuel when you coast in gear. There's a dialogue in MS where you can adjust it or turn it off.
#70
Elite Member
Thread Starter
iTrader: (9)
Join Date: Sep 2008
Location: Michigan
Posts: 5,609
Total Cats: 13
Well, I looked at the log. Honestly, I don't see much wrong there. I see AFR going up to about 12.5:1, but a bit of tuning would take care of that. I don't see AFRs going "crazy," and I don't see anything that would cause rough running.
???
At 15psi, you've got enough boost to blow out your spark unless you've got a smaller gap or have COPs or LS coils. Assume you've taken steps to prevent spark blowout?
BTW, if you are concerned about AFR's going to 20:1+ when you let off the throttle, that behavior is normal. It's called "overrun cutoff" and is designed to cut fuel when you coast in gear. There's a dialogue in MS where you can adjust it or turn it off.
???
At 15psi, you've got enough boost to blow out your spark unless you've got a smaller gap or have COPs or LS coils. Assume you've taken steps to prevent spark blowout?
BTW, if you are concerned about AFR's going to 20:1+ when you let off the throttle, that behavior is normal. It's called "overrun cutoff" and is designed to cut fuel when you coast in gear. There's a dialogue in MS where you can adjust it or turn it off.
Then if I the car is warmed up, during cruising I get AFRs on the 17-18 which I've never see. The car cruised between 15.6 and 16 before. I don't get what could've caused this. The car drove fine since the leak was fixed then after one drive I felt some sort of misfire then all this started. I checked the engine bay and everything seems to be in place. don't know what to do
#72
Elite Member
Thread Starter
iTrader: (9)
Join Date: Sep 2008
Location: Michigan
Posts: 5,609
Total Cats: 13
Could there be any enrichment that should be turned off? even if that's the case it wouldn't explain why the car is running erratic from one moment to the next
#75
Elite Member
Thread Starter
iTrader: (9)
Join Date: Sep 2008
Location: Michigan
Posts: 5,609
Total Cats: 13
I pulled the spark plugs to see what they looked like and this is what I got. There was some water drops on cylinder 3 ... maybe that's what caused the issues
IMG_1473_zps25295494.jpg Photo by superbuffon01 | Photobucket
I didn't know that. I just took the car for a drive to vatozone. On the way over there I had the issue happening to me. When I got back I made sure that the timing was correct and I did a log. I was able to do an almost full 3rd gear pull and a bit of 4th. There was just one lean spot that's clearly evident in the log.
TPS is now calibrated 0 = closed and 100 = open
IMG_1473_zps25295494.jpg Photo by superbuffon01 | Photobucket
TPS is now calibrated 0 = closed and 100 = open
#77
The lean event in the 3rd gear pull is clearly linked to a drop in the "RPM/100" signal. I identified another drop in the "RPM" signal during your 4th gear pull which also resulted in a lean spike. Note that these parameters ("RPM," "RPM/100," "PW," and "DutyCycle1") are not all logged at the same time. That's why the drop in the 3rd gear pull only shows in the "RPM/100" line, while the drop in the 4th gear pull only shows in the "RPM" line. In reality, they're happening in all of the parameters as reflected by the AFR.
Sooooooo . . . looks like you may have an issue with the CAS. I'd be looking at the wiring/grounding/water. If there's nothing obvious there, you may need a new CAS.
#80
Elite Member
Thread Starter
iTrader: (9)
Join Date: Sep 2008
Location: Michigan
Posts: 5,609
Total Cats: 13
Water and ignition components = BAD. Make sure you're using dielectric grease on the boots.
Caught it. I circled a couple of events from those pulls below in blue.
The lean event in the 3rd gear pull is clearly linked to a drop in the "RPM/100" signal. I identified another drop in the "RPM" signal during your 4th gear pull which also resulted in a lean spike. Note that these parameters ("RPM," "RPM/100," "PW," and "DutyCycle1") are not all logged at the same time. That's why the drop in the 3rd gear pull only shows in the "RPM/100" line, while the drop in the 4th gear pull only shows in the "RPM" line. In reality, they're happening in all of the parameters as reflected by the AFR.
Sooooooo . . . looks like you may have an issue with the CAS. I'd be looking at the wiring/grounding/water. If there's nothing obvious there, you may need a new CAS.
Caught it. I circled a couple of events from those pulls below in blue.
The lean event in the 3rd gear pull is clearly linked to a drop in the "RPM/100" signal. I identified another drop in the "RPM" signal during your 4th gear pull which also resulted in a lean spike. Note that these parameters ("RPM," "RPM/100," "PW," and "DutyCycle1") are not all logged at the same time. That's why the drop in the 3rd gear pull only shows in the "RPM/100" line, while the drop in the 4th gear pull only shows in the "RPM" line. In reality, they're happening in all of the parameters as reflected by the AFR.
Sooooooo . . . looks like you may have an issue with the CAS. I'd be looking at the wiring/grounding/water. If there's nothing obvious there, you may need a new CAS.
Thread
Thread Starter
Forum
Replies
Last Post