Hope its your common prob.....
Thread Starter
Senior Member
Joined: Oct 2005
Posts: 874
Likes: 0
From: Waldorf, MD
Car: 91 Formula, 89 IROC
Engine: LB9, LB9
Transmission: 700R4, 700R4
Axle/Gears: Posi 2.73, Posi 2.73
Hope its your common prob.....
Well guys the car runs real great and all. I have done cap, rotor, wires, and plugs. I plan on doing a fuel filter and maybe a IAC soon. The thing that just began to happen is a tiny surge at idle. It is not like a 800000000rpm surge, it just goes from like normal for a few seconds and then to like 800rpm for a sec and then back down for a few more seconds then back up. Is there anything I am overlooking possibly?
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iTrader: (7)
Joined: Aug 2005
Posts: 1,068
Likes: 1
From: Ohio, near columbus
Car: 89 iroc-z
Engine: 305tpi
Transmission: wc-t5
Axle/Gears: 10 bolt 3.08 posi (4 now)
either a vaccum leak or stuck egr valve most likely. Is your check engine light on?
Senior Member
Joined: Oct 1999
Posts: 6,621
Likes: 2
Car: 91 Red Sled
Axle/Gears: 10bolt Richmond 3.73 Torsen
Sounds like a lean surge, very slight. If the surge is methodical then it's fuel, if it almost stalls then quickly jumps up then it's too much timing.
Change your fuel filter and retest.
Change your fuel filter and retest.
Thread Starter
Senior Member
Joined: Oct 2005
Posts: 874
Likes: 0
From: Waldorf, MD
Car: 91 Formula, 89 IROC
Engine: LB9, LB9
Transmission: 700R4, 700R4
Axle/Gears: Posi 2.73, Posi 2.73
There is no check engine light, and it happens consistent. The car has 175,000 miles if that makes a difference.
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