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Car holding vacuum and making boost but AFR gauge is wonky

 
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canyonblaster  



Joined: 20 Aug 2012
Posts: 386
Location: Denver, CO, USA

PostPosted: Sat May 13, 2017 6:47 am    Post subject: Car holding vacuum and making boost but AFR gauge is wonky Reply with quote

Guys,

My car has Dan's Intercooler kit. Love it. Car was running great, making 10 psi consistently and the boost gauge works fine. The AFR gauge WAS working fine, showing approx 14.7 at idle and around 10-11 at WOT/ on boost.

The AFR gauge is now just wonky, all over the place. Acts like it has a short but the power is constant (light doesn't flicker, etc).

Car runs fine. Boost gauge has no issues and the car doesn't drive any different. Porsche mechanic says car holds vacuum and makes boost just like it was previously.

Is it possible that the wide band Ox Sensor that feeds info to the AFR gauge went bad? Or the gauge went bad?
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Carrera RSR  



Joined: 08 Jan 2010
Posts: 1535
Location: Somerset, UK

PostPosted: Sat May 13, 2017 7:18 am    Post subject: Reply with quote

Innovate AFR sensor/gauge? Mine needed constant recalibration. Got fed up with it. Sold it. Bought a Zeitronix. Never looked back.
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1980 931 - forged pistons, Piper cam, CGT turbo, 951 ducted FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife LSD
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canyonblaster  



Joined: 20 Aug 2012
Posts: 386
Location: Denver, CO, USA

PostPosted: Sat May 13, 2017 7:22 am    Post subject: Reply with quote

AEM analog...

Carrera RSR wrote:
Innovate AFR sensor/gauge? Mine needed constant recalibration. Got fed up with it. Sold it. Bought a Zeitronix. Never looked back.

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Carrera RSR  



Joined: 08 Jan 2010
Posts: 1535
Location: Somerset, UK

PostPosted: Sat May 13, 2017 7:31 am    Post subject: Reply with quote

Some need calibrating. Sensor can go bad.
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1980 931 - forged pistons, Piper cam, CGT turbo, 951 ducted FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife LSD
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Rasta Monsta  



Joined: 12 Jul 2006
Posts: 11351
Location: PacNW

PostPosted: Sat May 13, 2017 2:49 pm    Post subject: Reply with quote

Pretty simple device. Unless there is a wiring fault you may be seeing an actual fueling problem.
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ideola  



Joined: 01 Oct 2004
Posts: 15489
Location: Woodstock IL

PostPosted: Sat May 13, 2017 11:12 pm    Post subject: Reply with quote

It's an AEM unit, and I do not have the recalibration issues with mine that are commonly reported with the Innovate stuff.

It is almost certainly a failed sensor due to the <ahem> event that you experienced.
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canyonblaster  



Joined: 20 Aug 2012
Posts: 386
Location: Denver, CO, USA

PostPosted: Wed Jun 14, 2017 3:54 am    Post subject: Reply with quote

Thx guys. We replaced the sensor. AFR gauge is same, wonky, all over the place. I am taking the car to better shop, one that has smoke and can fix it.
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924-76  



Joined: 05 Jun 2006
Posts: 1338
Location: Ontario, Canada

PostPosted: Sat Jun 17, 2017 9:51 pm    Post subject: Reply with quote

Rasta Monsta wrote:
... you may be seeing an actual fueling problem.

Have you check you fuel pressure? Could be a faulty WUR.
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