[V8] 1993 V8 - will not idle properly

[Dave Saad]

Obviously you have way too much new stuff!

Sent from my iPhone

On Feb 11, 2013, at 9:12 PM, "Paul Jager" <pjager at telus.net> wrote:

> 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
> 
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