Re: [DML] Overheating, idle speed and stalling issues
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Re: [DML] Overheating, idle speed and stalling issues

Hi Glenn,

The three issues are not separate as you might believe.

1. This sounds like bad news. Your findings point to failed head gasket. 
There is a way to check that without taking the engine apart. Get a cooling 
system pressure tester with a gauge. Install it in place of the cap on the 
overflow bottle and start the engine. Keep an eye on the pressure in the 
cooling system. If you see it rise quickly you have a blown head gasket.
Another way to see is to simply remove the cap and look inside the bottle. 
If you see lots of small bubbles come up you have a leak.
Yet another way to check is to test for exhaust gasses in the coolant. Ask 
at your favorite auto parts store.

You are correct about the fans. They should pull the air from the front of 
the car through the radiator and push it towards the rear of the car.

2. The seeking indicates wrong CO2 setting. This might be caused by blown 
head gasket but it might be something else like plugged injectors, old spark 
plugs, old or incorrect O2 sensor, bad spark plug wires etc.
It runs smooth when cold because the lambda system starts "listening" to the 
O2 sensor when it gets hot enough. Before when the sensor is cold it runs in 
open-loop without actually adjusting the mixture.

3. Stalling when shifting is related to number 2 and might be caused by 
number 1 issue.

As you can see this is probably just one problem that manifest itself in 
many ways. Start with making sure the head gaskets are good and not leaking 
and go from there.

Good luck

Greetings from Poland!
Tom Niemczewski
Vin 6149 plus 2418, 3633, 5030, 16473, 17086
Google earth: 52°25'17.66"N, 21° 1'58.40"E

From: "jedimasterglenn" <jedimasterglenn@xxxxxxxxxxx>
Sent: Monday, April 16, 2012 3:22 AM
To: <dmcnews@xxxxxxxxxxxxxxx>
Subject: [DML] Overheating, idle speed and stalling issues

> Need some advice (or a DeLorean mechanic to open shop in MA!!) on what to 
> try next for what I think are 3 separate issues:
> 1.  I recently replaced my entire cooling system:  radiator, fans & fan 
> assembly, new water pump & thermostat, coolant bottle, and all the hoses 
> except the ones to the heater > 2.  Prior to the cooling system 
> replacement and since, my idle speed has been rough.  When I first start 
> the car, the idle is good, hovering just below 1000rpms.
> 3.  And rounding out my collection of headaches is what I like to call the 
> "downshift-stall mystery".


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