Anybody's speedo jump up when rev engine in nuetral? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Russell James · 03-29-2010, 08:19 PM

Ran into a strange quirk after installing long tube headers and a catback. No codes or CEL light after the header install. But if I rev it hard in nuetral with the clutch out, sometimes the speedo jumps up. If the DIC is set on speedo it will jump up to 20 ish and then count down as the revs come down. If the brake is on I get a DIC warning to release the brake.

Possibly not related to the headers, never really rev'd it hard before putting the headers on. But now that it sounds so good, of course had to romp it a few times in nuetral. Not even close to red line, just a second or two quick rev up to 5K or so. The only wiring messed with was the O2's and extensions... Maybe they are tied off to other wires too close or something interfering with the speed sensor signal?

Just curious if anyone else has seen that. Doing it when the clutch is out, wonder if something is spinning up in the trans. Car is brand new tight, 100 miles.

SATXLS3 · 03-29-2010, 08:44 PM

DID NOT NOTICE THE SPEEDO, ILL TAKE A LOOK 2MORROW

DMAX · 03-29-2010, 08:53 PM

Mine does the same thing .

yota924x4 · 03-29-2010, 09:24 PM

same here too, you'll even get the beeping telling you to release the parking brake too. i guess the car thinks its moving?

Russell James · 03-29-2010, 10:42 PM

Good to know others are doing it. Must just be some quirk.

03-29-2010, 08:19 PM	#1
Russell James Drives: '15 SS 1LE, '69 Z28 drag car Join Date: Dec 2009 Location: Mich Posts: 4,482	Anybody's speedo jump up when rev engine in nuetral? Ran into a strange quirk after installing long tube headers and a catback. No codes or CEL light after the header install. But if I rev it hard in nuetral with the clutch out, sometimes the speedo jumps up. If the DIC is set on speedo it will jump up to 20 ish and then count down as the revs come down. If the brake is on I get a DIC warning to release the brake. Possibly not related to the headers, never really rev'd it hard before putting the headers on. But now that it sounds so good, of course had to romp it a few times in nuetral. Not even close to red line, just a second or two quick rev up to 5K or so. The only wiring messed with was the O2's and extensions... Maybe they are tied off to other wires too close or something interfering with the speed sensor signal? Just curious if anyone else has seen that. Doing it when the clutch is out, wonder if something is spinning up in the trans. Car is brand new tight, 100 miles.

03-29-2010, 08:44 PM	#2
SATXLS3 Drives: 2012 GMC Sierra Z71 4x4 Crew Join Date: Feb 2010 Location: San Antonio, Tx Posts: 1,229 View My Garage	HAVE HAD THE BRAKE RELEASE WARNING DID NOT NOTICE THE SPEEDO, ILL TAKE A LOOK 2MORROW

03-29-2010, 09:24 PM	#4
yota924x4 Drives: 2010 Camaro SS m6, 1970 Nova SS396 Join Date: Feb 2010 Location: pittsburgh, pa Posts: 50	same here too, you'll even get the beeping telling you to release the parking brake too. i guess the car thinks its moving? __________________

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03-29-2010, 08:53 PM	#3
DMAX Drives: 01 silverado 2010 2SS/RS Sim Join Date: Jun 2009 Location: MA Posts: 211	Mine does the same thing .

03-29-2010, 10:42 PM	#5
Russell James Drives: '15 SS 1LE, '69 Z28 drag car Join Date: Dec 2009 Location: Mich Posts: 4,482	Good to know others are doing it. Must just be some quirk.