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Take of the catalyst converter off and see how it runs without it. A guy at a tech session had the same problem for months and we went through everything and tried everything. Turn es out the catalyst converter over heated at some point in the past and was clogged up and causing a back fire in the system when he accelerated.

--- On Mon, 7/7/08, Tom Niemczewski <dmctom@xxxxxxxxx> wrote:

From: Tom Niemczewski <dmctom@xxxxxxxxx>
To: dmcnews@xxxxxxxxxxxxxxx
Date: Monday, July 7, 2008, 2:26 PM

Hi Mike

The hunting on a warm engine indicates that the CO setting is right on the 
border of the ECU control capability.
Has the O2 sensor been replaced along with all the other stuff? I would 
recommend replacing the sensor and checking the operation of this circuit 
with a dwell meter.
There might be other issues as well. The so called warm-up regulator or the 
temperature sensor located the thermostat housing. Check to make sure it's 
still connected and that the connection is clean and tight.

Good luck

Tom Niemczewski
vin 6149 (in Poland!)
Google earth: 52°25'17.30"N 21° 1'58.00"E
dmctom@gmail. com
www.deloreana. com

----- Original Message ----- 
From: "mike clemens" <rmclemns@yahoo. com>
To: <dmcnews@yahoogroups .com>
Sent: Monday, July 07, 2008 12:08 AM

> Josh's car has once again got me stumped. Here's what is happening: 
> Start the car up and it idles right on specs, try to give it gas and it 
> wants to hesitate and almost quit. Back off the gas, it goes back to 
> idle. As the car warms up, you can get more and more rpm but never full 
> throttle. After the car is warmed up to where the fans come on, the idle 
> hunts up and down, between 650 and 850 rpm. The car starts backfiring if 
> you try to go above 5000 rpm. If you move the throttle off the 
> microswitch that controls the frequency valve, idle stabilizes at 950-100 
> rpm.
> The plugs are new, the idle speed motor is new, the injectors have been 
> cleaned by JH and are all working. All vacuum lines have either been 
> checked or are new, no leaks.
> Any ideas of what might be wrong?
> Mike TPS 1630
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