Skip while under partial load Data logs attached
04-11-2008, 03:05 PM
#123
Race Car
Thread Starter
One other thing comes to mind, when rebuilding my intake to adjust my throttle body to open fully I had to adj the throttle mechanism to the very end. This caused the Rpm's to go to 2K. I adjusted the Port on the throttle body so it is completely closed to get the idle down to the correct level.
04-11-2008, 03:48 PM
#124
Rennlist Member
2.8v is a little higher than normal (2.7v). But I'm not sure whether that is a problem, or what might cause that in your case.
Be a good idea to check idle fuel pressure should be 30psi at idle.
Be a good idea to check idle fuel pressure should be 30psi at idle.
04-11-2008, 03:52 PM
#125
Race Car
Thread Starter
Fuel pressure is at 32 at idle just checked it!
This just does not make sense, if I add the Ox sensor I'm sure I will be close but it will never be base lined.
This just does not make sense, if I add the Ox sensor I'm sure I will be close but it will never be base lined.
04-12-2008, 06:05 PM
#130
Race Car
Thread Starter
I am beginning to wonder if I have a wiring issue with my car due to the following facts.
I cannot adjust my A/F to stoic 14.7 at idle with the ox sensor disconnected even with the super charger removed. With the Ox sensor connected it will go to 14.7 but under laod it does all kinds of strange things. I believe that the LH can compensate up to about 20% but add Boost to that and all bets are off. Since I have a rebuilt and verified Maf it seems to be logical that I may have a wiring issue.
I need to test for current leakage on my wiring starting with the Maf and need to build some type of testing device.
I have a amprobe acdc-620T meter:
0-399.9, 1000A ±(1.5% Rdg + 3 LSD) @0-400A DC ±(2% Rdg + 5 LSD) @ 45-65Hz, 40-400A AC
I want to induce a low voltage and test the current leakage comparing the cable pairs on the Maf and other connections.
What do I need to do this?
I do have a voltage generator that goes up to 16v and about 3-amps.
Any help would be greatly appreciated "Alan".
Firemed suggested a voltage source and a bulb and read the current and try to compare the readings using my meter. Has anyone done this if so what and how have you done this?
I cannot adjust my A/F to stoic 14.7 at idle with the ox sensor disconnected even with the super charger removed. With the Ox sensor connected it will go to 14.7 but under laod it does all kinds of strange things. I believe that the LH can compensate up to about 20% but add Boost to that and all bets are off. Since I have a rebuilt and verified Maf it seems to be logical that I may have a wiring issue.
I need to test for current leakage on my wiring starting with the Maf and need to build some type of testing device.
I have a amprobe acdc-620T meter:
0-399.9, 1000A ±(1.5% Rdg + 3 LSD) @0-400A DC ±(2% Rdg + 5 LSD) @ 45-65Hz, 40-400A AC
I want to induce a low voltage and test the current leakage comparing the cable pairs on the Maf and other connections.
What do I need to do this?
I do have a voltage generator that goes up to 16v and about 3-amps.
Any help would be greatly appreciated "Alan".
Firemed suggested a voltage source and a bulb and read the current and try to compare the readings using my meter. Has anyone done this if so what and how have you done this?
04-13-2008, 06:58 AM
#132
Rennlist Member
Under load the LH goes open loop, at cruise you should be closed loop at 14.7.
Be very careful connecting voltage sources to the LH or MAF.... suggest a safer way to diagnose might be to swap in known good and MAFs.
Be very careful connecting voltage sources to the LH or MAF.... suggest a safer way to diagnose might be to swap in known good and MAFs.
04-13-2008, 11:06 AM
#133
Man of many SIGs
Rennlist Member
Rennlist Member
Mark,
Did you ever double check your baseline fuel pressure like Mr. Speake reccomended? Have you tried disconnecting the FMU to see if that helps your rich condition?
Maybe I'm wrong but it seems that your issue has changed somewhat. Originally your complaint was that the fuel was cutting off briefly while driving and you felt that you were lean. Now you are rich under all conditions. I notice in your last chart that you have three areas where you go super lean. All of those correspond to an RPM drop. At first I thought that was you coming off the throttle while shifting but upon closer inspection, it doesn't appear that your G's are doing much so I'm thinking that this is when the car is stalling. Am I correct? Please clarify.
BTW. If you save your logs as JPG instead of PDF you can post them here instead of just a link. More people will look at them that way.
Did you ever double check your baseline fuel pressure like Mr. Speake reccomended? Have you tried disconnecting the FMU to see if that helps your rich condition?
Maybe I'm wrong but it seems that your issue has changed somewhat. Originally your complaint was that the fuel was cutting off briefly while driving and you felt that you were lean. Now you are rich under all conditions. I notice in your last chart that you have three areas where you go super lean. All of those correspond to an RPM drop. At first I thought that was you coming off the throttle while shifting but upon closer inspection, it doesn't appear that your G's are doing much so I'm thinking that this is when the car is stalling. Am I correct? Please clarify.
BTW. If you save your logs as JPG instead of PDF you can post them here instead of just a link. More people will look at them that way.
04-13-2008, 01:43 PM
#134
Race Car
Thread Starter
Shawn,
Here are the latest log at idle Maf at 383 Ohms as you can see its very rich.
FP is spot on at 32 at idle seems like the Maf is not sending the correct reading to the LH.
I am borrowing a Maf and LH from Mike to be sure.
I did a current test on the Harness and all were fine.
Here are the latest log at idle Maf at 383 Ohms as you can see its very rich.
FP is spot on at 32 at idle seems like the Maf is not sending the correct reading to the LH.
I am borrowing a Maf and LH from Mike to be sure.
I did a current test on the Harness and all were fine.
04-17-2008, 01:26 PM
#135
Race Car
Thread Starter
I received my custom designed Maf form Injection laps that included two trim pots to adjust the Voltage sent to the Lh.
I was amazed that by turning these it really allowed for a tremendous change up to 22 A/F on the lean side. It took a while of pulling the Maf on and off to tweak the settings but it seems now I'm dialed in to the magic 14.7 A/F ratio. The car is no longer stalling, skipping and running rich. I am very gun shy at this point so I do not want to claim victory and jinx myself. I need to data log a few more runs and see if I'm tuned in at WOT. I did see some oil a few drops on the front part of my S/C but cannot find a leak could this indicate a seal leak?
I was amazed that by turning these it really allowed for a tremendous change up to 22 A/F on the lean side. It took a while of pulling the Maf on and off to tweak the settings but it seems now I'm dialed in to the magic 14.7 A/F ratio. The car is no longer stalling, skipping and running rich. I am very gun shy at this point so I do not want to claim victory and jinx myself. I need to data log a few more runs and see if I'm tuned in at WOT. I did see some oil a few drops on the front part of my S/C but cannot find a leak could this indicate a seal leak?