H/C Problem, need help...
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Joined: Nov 2001
Posts: 1,356
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From: Northridge, CA
H/C Problem, need help... Ok,
I am a fairly new LS1Edit user, but I think that I have been relatively successful up to this point!
Here are a list of my engine mods:
- Stock exhaust w/no cats & o2 sims
- Katech Ported TB
- SLP 85mm MAF
- LS6 Intake no/EGR
- !AIR & !EGR
- ARE Stage 2 Heads (not milled 2.08/1.60)
- Turbo Cam 218/218 .518 114
- 38 lb/hr. lucas injectors
- NGK TR-6 plugs gapped @ .35
- Taylor Wires
- ASP Pulleys
Problem:
At WOT the car falls on its face at 3500 and above...after it hits 3500 it will SLOWLY climb to 4000 and then RPMs will steadily drop until I lift.
O2 readings are extremely rich .930 and higher and I am getting no knock retard at all.
I am setting a high MAF code at 3500 rpm...the sensor is maxing at 58 g/sec.
I have 18" of vacuum at idle, so I do not think that there is a vacuum leak.
Diagnosis:
I unplugged the MAF and the car will pull through the RPM band, but I am seeing O2s of .940-.960 and it feels sluggish because it is so rich.
I plugged the MAF back in and tried leaning the car out via the PE vs. RPM table, but it did not help.
History:
The 85mm MAF worked fine when my car had the TTs on it.
I adjusted the Injector Flow Rate table to accomodate for the 38 lb/hr. injectors based on the spreadsheet that ChrisB posted.
So ???
I'm thinking that the MAF is bad or there is a parameter in LS1Edit related to the MAF that I need to tweak?
I am going to try my stock MAF when I get a chance, but that won't be for a few days when I am home. Any suggestions?
Thanks,
Scott
I am a fairly new LS1Edit user, but I think that I have been relatively successful up to this point!
Here are a list of my engine mods:
- Stock exhaust w/no cats & o2 sims
- Katech Ported TB
- SLP 85mm MAF
- LS6 Intake no/EGR
- !AIR & !EGR
- ARE Stage 2 Heads (not milled 2.08/1.60)
- Turbo Cam 218/218 .518 114
- 38 lb/hr. lucas injectors
- NGK TR-6 plugs gapped @ .35
- Taylor Wires
- ASP Pulleys
Problem:
At WOT the car falls on its face at 3500 and above...after it hits 3500 it will SLOWLY climb to 4000 and then RPMs will steadily drop until I lift.
O2 readings are extremely rich .930 and higher and I am getting no knock retard at all.
I am setting a high MAF code at 3500 rpm...the sensor is maxing at 58 g/sec.
I have 18" of vacuum at idle, so I do not think that there is a vacuum leak.
Diagnosis:
I unplugged the MAF and the car will pull through the RPM band, but I am seeing O2s of .940-.960 and it feels sluggish because it is so rich.
I plugged the MAF back in and tried leaning the car out via the PE vs. RPM table, but it did not help.
History:
The 85mm MAF worked fine when my car had the TTs on it.
I adjusted the Injector Flow Rate table to accomodate for the 38 lb/hr. injectors based on the spreadsheet that ChrisB posted.
So ???
I'm thinking that the MAF is bad or there is a parameter in LS1Edit related to the MAF that I need to tweak?
I am going to try my stock MAF when I get a chance, but that won't be for a few days when I am home. Any suggestions?
Thanks,
Scott
Re: H/C Problem, need help... I am going to go with the bad MAF senario. I can't think of any thing else it could be.
Ryan K. <img border="0" alt="[Fluffy]" title="" src="graemlins/fluffy.gif" />
Ryan K. <img border="0" alt="[Fluffy]" title="" src="graemlins/fluffy.gif" />
Re: H/C Problem, need help... If you can pick up some spray can electrical cleaner at Radio Shack you can clean the MAF wires and see if that helps. I've seen them so gunked with black goo that I was not surprised at all when the guy told me the car 'ran rough' with that MAF. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
Just don't scrub the wires, use the spray cleaner, and if necessary, a light brush with a q-tip.
-Andrew
Just don't scrub the wires, use the spray cleaner, and if necessary, a light brush with a q-tip.
-Andrew
Thread Starter
TECH Fanatic
iTrader: (2)
Joined: Nov 2001
Posts: 1,356
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From: Northridge, CA
Re: H/C Problem, need help... Guys,
Turns out that it was the MAF...I put the stocker in and things are fine.
I haven't tried cleaning the SLP unit yet, but I will post when I do and let you know if it worked.
Thanks,
Scott
Turns out that it was the MAF...I put the stocker in and things are fine.
I haven't tried cleaning the SLP unit yet, but I will post when I do and let you know if it worked.
Thanks,
Scott
