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#1
01-03-2012, 10:50 AM
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2005 GP GTP running very rich
I have started to experience this issue the car burns gas like crazy. I get less then 100 miles on the tank. No check engine lite is on. I have replaced plugs and wires about a year ago. Car runs fine. The DIC shows 10 miles per gallon. I have a v8 car that is better on gas now. Any suggestions what can cause such a poor gas mileage.
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#2
01-03-2012, 10:54 AM
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Re: 2005 GP GTP running very rich
Change the upstream O2 sensor. It controls the amount of fuel that the computer sends to the engine and a significant decrease in fuel mileage is one of the signs that the sensor is going bad.
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#4
01-03-2012, 12:20 PM
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Re: 2005 GP GTP running very rich
Yes, but it is possible that it is bad even though it was replaced. Next, are you sure that
you don't have a fuel leak or is there a possibility that someone is stealing your gas? Did you get bad mileage before you changed the sensor?
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#5
01-03-2012, 01:14 PM
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Re: 2005 GP GTP running very rich
Also check your air filter(dirty) or check vac line to f/p regulator for fuel....check for codes, just to see if you can communicate with the PCM....
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#6
01-03-2012, 05:49 PM
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Re: 2005 GP GTP running very rich
did you gap the plugs properly? Is the car sluggish?
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2004 GRAND PRIX GTP COMP G. VIN 4 : OVERKILL CUSTOM PCM, WIZAIR CAI, ZZP TRAILING ARMS, W BODY STORE LATERAL ARMS, ALL POLY/SOLID MOUNTS, STB F&R, ZZP RACE TRANS, ALT REWIRE & VOLTAGE BSTR, 180 STAT, NGK TR6, MPS with 3.4 PULLEY, PACESETTER HEADERS, 1.8 ROLLER ROCKERS, FP REWIRE,ZZP COILS/WIRES, TB SPACER, D&S ROTORS, INTERCEPTOR SCAN GAUGE, CUSTOM STAINLESS 2.5 INCH CAT BACK EXHAUST. 2004 Honda Odyssey EX-L 
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#8
01-03-2012, 07:35 PM
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Re: 2005 GP GTP running very rich
definately remove the plugs and check the gaps on all of them. Some of them come pre-gapped but I never trust them. always check the gap. what kind of plugs did you use? change the pcv valve. also, clean the throttle body and use seafoam in the gas tank as well as in the intake.
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2004 GRAND PRIX GTP COMP G. VIN 4 : OVERKILL CUSTOM PCM, WIZAIR CAI, ZZP TRAILING ARMS, W BODY STORE LATERAL ARMS, ALL POLY/SOLID MOUNTS, STB F&R, ZZP RACE TRANS, ALT REWIRE & VOLTAGE BSTR, 180 STAT, NGK TR6, MPS with 3.4 PULLEY, PACESETTER HEADERS, 1.8 ROLLER ROCKERS, FP REWIRE,ZZP COILS/WIRES, TB SPACER, D&S ROTORS, INTERCEPTOR SCAN GAUGE, CUSTOM STAINLESS 2.5 INCH CAT BACK EXHAUST. 2004 Honda Odyssey EX-L
Last edited by rickisrad; 01-03-2012 at 07:42 PM. Reason: added content
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#9
01-03-2012, 07:50 PM
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Re: 2005 GP GTP running very rich
for comparision sake I get 19.7 mpg in my Comp G and I definately use the gas pedal
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2004 GRAND PRIX GTP COMP G. VIN 4 : OVERKILL CUSTOM PCM, WIZAIR CAI, ZZP TRAILING ARMS, W BODY STORE LATERAL ARMS, ALL POLY/SOLID MOUNTS, STB F&R, ZZP RACE TRANS, ALT REWIRE & VOLTAGE BSTR, 180 STAT, NGK TR6, MPS with 3.4 PULLEY, PACESETTER HEADERS, 1.8 ROLLER ROCKERS, FP REWIRE,ZZP COILS/WIRES, TB SPACER, D&S ROTORS, INTERCEPTOR SCAN GAUGE, CUSTOM STAINLESS 2.5 INCH CAT BACK EXHAUST. 2004 Honda Odyssey EX-L
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#12
01-16-2012, 06:00 PM
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Re: 2005 GP GTP running very rich
did you check the plug gaps yet???? also take off your maf and get the maf specific cleaner (green label) and clean the wire/sensors off very well, do not touch the wires!!!!!!!!! I have seen this have a significant improvement.
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2004 GRAND PRIX GTP COMP G. VIN 4 : OVERKILL CUSTOM PCM, WIZAIR CAI, ZZP TRAILING ARMS, W BODY STORE LATERAL ARMS, ALL POLY/SOLID MOUNTS, STB F&R, ZZP RACE TRANS, ALT REWIRE & VOLTAGE BSTR, 180 STAT, NGK TR6, MPS with 3.4 PULLEY, PACESETTER HEADERS, 1.8 ROLLER ROCKERS, FP REWIRE,ZZP COILS/WIRES, TB SPACER, D&S ROTORS, INTERCEPTOR SCAN GAUGE, CUSTOM STAINLESS 2.5 INCH CAT BACK EXHAUST. 2004 Honda Odyssey EX-L
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#14
01-19-2012, 06:11 PM
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Re: 2005 GP GTP running very rich
Check your catalytic converter. It's a common problem on these cars
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