[V8] 1993 V8 - will not idle properly

[Paul Jager]

In order to rev up an engine needs air. So either via the ISV, the throttle 
plate or a leak, your engine is getting air.

Check for air leaks, it could be the signal to the ISV, the ISV itself. etc.

The MAF senses incoming air to match up fuel delivery. So a bad MAF will 
give improper mixture - which is running rough, choking and sputtering, no 
start, that sort of thing.



-----Original Message----- 
From: Ed Kellock
Sent: Monday, February 11, 2013 8:00 PM
To: 'W' ; v8 at audifans.com
Subject: Re: [V8] 1993 V8 - will not idle properly

I'm thinking the only thing that is even able to cause that sort of behavior
is the MAF, but this isn't much better than a guess.  I think you can run
the engine with the MAF unplugged. Maybe unplug it when the behavior is
occurring.

Ed



-----Original Message-----
From: v8-bounces at audifans.com [mailto:v8-bounces at audifans.com] On Behalf Of
W
Sent: Monday, February 11, 2013 7:50 PM
To: v8 at audifans.com
Subject: [V8] 1993 V8 - will not idle properly


I have a 1993 V8, 180,000 miles, in very, very good condition. Two days ago
it suddenly started idling high as if the engine has a mind of its own. The
idle will go from 1100 rpm to 2800 on its own. Consequently it cannot be
driven given the erratic behavior.  Have started it several times and on
occasion the idle will return to normal then suddenly go erratic again.
Wondering what could cause this and a possible solution. The fuel pressure
regulator is 5 yrs old. The ISV is a year old. The O2 sensor in 3 months.
New cats, 1 year. The two speed sensors are a year old. The coolant temp
sensor is 4 months old.  The MAF sensor is a year old. The TPS is 3 months
old. What could be the issue?



Thanks

Allan

Washington DC

'93 Audi V8 Q - Pearl White Tricoat

'84 Audi 4000 S Q - Montego Black

'81 Triumph TR8 - Poiseidon Green

'90 VW Corrado G60 - Pearl Blue

'91 Suzuki Samurai - White

'73 Mercedes Benz 450 SEL - Carnelian Red

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