weird problem

Reply Subscribe

Thread Tools

Search this Thread

Feb 15, 2011 | 09:21 AM

bizerk1

Thread Starter

TECH Regular

Joined: Jan 2011

Posts: 468

Likes: 0

From: Nw suburbs chicago

weird problem

so sometimes when im driving I get a problem and was wondering what it is. When i floor it going 20- 70 when it hits 70 the rpm will be at 5300-5500 and will just backfire alot and the tires will spin alot, but i can still floor it fine from 85 -140. bad spark plug is what im thinking so i think it needs tune up. Any one know??? its a 94 z28 a4, short ram intake , catback and cam and hurst shift kit

Feb 15, 2011 | 10:53 AM

bizerk1

Thread Starter

TECH Regular

Joined: Jan 2011

Posts: 468

Likes: 0

From: Nw suburbs chicago

is it optispark ??? help

Feb 15, 2011 | 12:48 PM

idformula

TECH Regular

Joined: May 2010

Posts: 481

Likes: 0

Do you have acess to a scanner? Obd1 can trip codes, but not set off the ses light, at least its done it on my car.

Feb 15, 2011 | 04:09 PM

bizerk1

Thread Starter

TECH Regular

Joined: Jan 2011

Posts: 468

Likes: 0

From: Nw suburbs chicago

no i dont

Feb 15, 2011 | 07:58 PM

jaycenk

TECH Addict

iTrader: (1)

Joined: Jun 2009

Posts: 2,210

Likes: 1

From: Holiday, FL

Go to autozone or advanced and have them scan it. Kind of odd that it only will do it at the top of second gear. Are you sure the trans isn't slipping and causing the engine to hit the rev limiter?

Feb 15, 2011 | 09:43 PM

Paul Bell

That's MISTER MODERATOR

iTrader: (9)

Joined: Nov 2005

Posts: 7,616

Likes: 65

From: NYC

You're not giving us much info. When you floor it it holds the gear and it won't shift?

Feb 15, 2011 | 10:32 PM

RedHotG8

TECH Fanatic

iTrader: (1)

Joined: May 2010

Posts: 1,419

Likes: 1

From: Chicagoland

Backfiring means the timing is off, so more than likely the timing chain is stretched. That causes the timing to vary under power. It could also be a bad opti-spark module.

Reply Subscribe