[urq] 83 URQ 10v Backfire in throttle body ?

[Mike Sylvester]

You almost always have to check for a vacuum leak if you have a running
problem with CIS.

A vacuum leak can cause the throttle plate to drop and cause that
popping.
What happens if you remove the oil fill cap while it is running?
If it doesn't stall out then you have a vacuum leak which has been
compensated for by adjusting the 3mm allen.

Mike

www.urq20v.com

> -------- Original Message --------
> Subject: Re: [urq] 83 URQ 10v Backfire in throttle body ?
> From: "Brandon Rogers" <brogers at terrix.com>

> Vacuum leak?  I'm having a hard time remembering the causes of this....
> So I guess I'm defaulting to what I believe to be the most common issue that
> causes running/starting problems on a WX motor.
> 
> Brandon
> 
> -----Original Message-----
Tim Maskus
> Sent: Tuesday, September 08, 2009 9:31 AM
> *I have had my 83 sitting for awhile in the driveway, and went out to start
> it and the battery was dead. Charged it up and moved it into the garage.
> Problem is is pops and backfires through the throttle body. I checked the
> air intake temp sensor and the wires are ok. I cleaned it , but no changes.
> Swapped the plugs,rotor, still no changes. Any ideas on where to look for
> the problem ?   Thanks - Tim*
> _______________________________________________