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04-26-2008
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#1 |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,677
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Ported Plenum Now Code 55
OK. Finally got the car on the road. Top End is now ported and matched to heads. Runs well. EXCEPT, when I punch it at lower rpm,
about 2-3K, I get a Code 55 (Fuel System Lean). Along with the porting, the secondary throttle plates are removed, new Accel injectors, 63mm TBs. I have made some alterations to the calibration to deal with secondaries operating always. I have checked Scondary FP. It runs. Haven't check FPressure yet. Any suggestions? |
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04-26-2008
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#2 |
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Join Date: Oct 2007
Location: lone pine and mammoth lakes ca.
Posts: 544
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Re: Ported Plenum Now Code 55
dom , are you using the mapping from my prom? if so i will call corey and get his ideas as what to do . let me know .might take a day to get back as water probs still there .
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04-26-2008
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#3 | |
 
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,140
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Re: Ported Plenum Now Code 55
Quote:
Don't Punch it at the lower RPMs 
__________________
1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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04-27-2008
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#4 |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,677
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Re: Ported Plenum Now Code 55
Jeff,
New piece of info. I've got a code 61 Port Throttle Fail before the code 55. Could be Port Throttle Failure may be causing code 55. ?? |
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04-27-2008
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#5 | |
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Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,140
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Re: Ported Plenum Now Code 55
Quote:
__________________
1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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04-27-2008
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#6 |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,677
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Re: Ported Plenum Now Code 55
Jeff,
May want to borrow you FP Gauge tomorrow and just check FP on Scdy Pump. |
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04-27-2008
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#7 | |
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Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,140
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Re: Ported Plenum Now Code 55
Quote:
__________________
1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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04-27-2008
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#8 |
Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: Ported Plenum Now Code 55
There's two possible problems. Code 61 could mean your O2 sensor(s) are degraded and need to be replaced, or it could mean a part throttle error, which would mean your throttle position sensor has gone bad.
From the problem you're describing, I'd bet your throttle position sensor has gone bad. I've had similiar experiences with bad TPS sensors. Dominic, did you plug the tps back in? LGAFF 92 ZR1 #234 |
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04-27-2008
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#9 |
Join Date: May 2005
Location: Leesburg, VA
Posts: 2,713
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Re: Ported Plenum Now Code 55
How exactly did you go about bypassing the secondaries? Code 61 sets when the secondaries are commanded open, but the car doesn't see vacuum of greater than 21kPa on the secondary MAP within 2 seconds.
The secondaries will then be commanded closed. Since yours can not close, I suspect it turns off your 2ndary injectors causing your lean condition.
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Bob Saveland Former owner of #2517 [IMG]http://a.random-image.net/aurora40/vette.jpg[/img] |
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04-27-2008
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#10 | |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,677
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Re: Ported Plenum Now Code 55
Quote:
And thanks for responding at that other place too. I'll need to check what's if anything is going on with the Scdy PT, but I wonder if I uncheck the MALF 61 bit, if that will cause the ECM to ignore the issue and just keep on going? I may have asked this question before although not necessarily in the same way. Last edited by XfireZ51; 03-08-2024 at 02:10 PM. |
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Linear Mode
