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Old 04-08-2005, 02:20 PM   #1
powerlabs
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Default GP Moto CEL fix = utterly useless waste of $30.

I had Borla headers and a Borla catback installed on my car and drove it for over 20thousand miles without the check engine light ever going on. A lot of people seem to experience a CEL with aftermarket headers, so I figured my ECU wasn't as picky as many others are.
Then I installed a random tech high flow catalytic converter. A couple hundred miles later the CEL came on; the classic P0420; catalytic converter low efficiency. This CEL will always come on after a long period of driving with cruise control or at part throttle.
Bought the GP Moto CEL fix, installed it, reflashed the ECU, and the CEL came on again after maybe 30 miles of cruising on the highway.
Conclusion; don't waste your money. Does anyone know of a CEL fix that actually works?
Here is what the GP Moto looks like. All mechanical CEL fixes are essentially the same thing; they place the rear O2 sensor further away from the exhaust gas flow.
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Old 04-08-2005, 09:53 PM   #2
washyu
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Yea I bought one also and it dosen't seem to work for me either. I have the stock headers, a random tec cat, and a Greddy Evo II cat back. It was weird I never had a cel, i have had this setup for almost a year, till last month so i decided to try this "fix" it was nice for the first 30 min then to started to run really rich and then started to misfire... I remove the fix and it seems fine now. Does any one know if the Pony Express will work on a 99?
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Old 04-09-2005, 09:43 AM   #3
ej25power
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washyu-Did you install it on the front O2 sensor? Doing anything to the rear sensor should have absolutely no effect on the car besides a CEL.

Also, the Pony Express seems to only work for some people.

Is there any way to just erase the PO420 code from the ecu? That would be the perfect solution in my book.

Geoff
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Old 04-09-2005, 01:27 PM   #4
HndaTch627
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none of them work....it's as simple as that. I had the pony express, it kept the MIL off but all it did was ever prevent the Catalyst Monitor from running
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Old 04-09-2005, 04:52 PM   #5
washyu
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No I installed it on the rear and I had that problem.


Quote:
Originally Posted by ej25power
washyu-Did you install it on the front O2 sensor? Doing anything to the rear sensor should have absolutely no effect on the car besides a CEL.

Also, the Pony Express seems to only work for some people.

Is there any way to just erase the PO420 code from the ecu? That would be the perfect solution in my book.

Geoff
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Old 04-09-2005, 10:41 PM   #6
Sharmin7
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go to advance auto and get 2 spark plug non-foulers which do the same thing as the GP moto CEL boss but they cost a total of $4.19 for both of them. You need to drill out the bottom so there is a little more flow then what they are when taken out of the package. Put them into a vice and tighten them together, then screw those into your header pipe as tight as possible with some teflon or anti-seize. then screw your O2 into the non-foulers and reset your ecu. It is pretty much the same idea as the boss but it takes the O2 even further out. Just a suggestion to try and lend a hand. worked for me so good luck
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Old 04-10-2005, 01:03 PM   #7
imprezzakc
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Wrap you header with header wrap . It will take a weekend to do . Solved my cell issue .
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Old 04-10-2005, 06:02 PM   #8
sebtarta
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Quote:
Originally Posted by imprezzakc
Wrap you header with header wrap . It will take a weekend to do . Solved my cell issue .
Not with me. I bought the borla headers, wrapped them up and coated them after. Once the install was on, it seemed to work great, but when i was cruising the CEL came on.
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Old 04-11-2005, 09:38 AM   #9
Aphex28
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I've seen Sharmin7's method work many times on STi's and WRX's. A good cheap fix.

The Pony Express one works for me though. Borla Headers, R/t Highflow cat & Borla Catback.
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Old 04-11-2005, 11:43 AM   #10
BlkTS02
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The mechanical fix worked for me. I didn't have enough room for both anti-foulers so I partially drilled out one of them and installed it.

No cel's since then.
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Old 04-11-2005, 12:32 PM   #11
powerlabs
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Quote:
Originally Posted by BlkTS02
The mechanical fix worked for me. I didn't have enough room for both anti-foulers so I partially drilled out one of them and installed it.

No cel's since then.
Do you have a high flow cat though?
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