RESUME: 100Q engine problems

[denis]

Car: Audi 100Q 1989

Engine: 2.3 NA CSI-3

symptoms:

- Hard starting hot and cold, starting as a big lazy cow.

- Lower power; cant pass other cars on the roads. If i push the accelerator more than the half the engine slow down instead of accelerate. I must let the engine take breath before push more on the accelerator. The sparkplugs look white and gray since the engine is going bad.

-Bad fuel economy

-The piston swim in fuel if i miss the first start on cold weather.

-Now the car is stalled 350km form home at -25C

I did:

-Installed a check engine light:Very useful.

-I Retrivied the fault codes: knock sensor only ; cleaned the sensor connector, was oxidated.

-Reset the fault code and checked for others . None since i fixed the knock sensor.

-Did output check with the check engine light;everythings ok.

-I changed the DPR connector and cleaned it, since that day the car ran powerful and good fuel economy for 2 weeks,,,, then back to a big lazy car...

-The fuel pump is 1 years old, i did not check the delivery rate. (Pressure dropped to 4.3this week.)I took the fuel pump from my ex-5000TQ 87 and was running very good before i removed. I should have took all the inject system from that car :-(.

-Checked the fuel filter on the fuel pump;ok

-Checked fuel lines:ok;They all been changed last summer 2004.

-Changed fuel filter close to the fuel distributor.17 dec 2004

-Checked fuel system pressure;4.5 bar and 67 psi with another meter.Dropped to 4.3 this week. System pressure drop immediately to 20psi when the engine stop. The pressure then drop slowly to 5 psi and stay there for maybe 5 hours.

-Just changed sparkplugs

-Try other sparkplugs wires;Beru. Checked on the dark if i can see any sparks come out the wires and distr. cap.OK

-Checked the vacuum: 9psi. suppose to be around 20. The only leak i found is one injector insert.

-I removed all the injectors and clean around, put silicon around them and putted them back. The stores were closed that time, it s why i did that.

-Removed the DPR and cleaned it.

-Just changed oil :castrol synthec 5W30. Cause the car was swimming is fuel;after lot of starts and wet cylinders


-Checked the current on the DPR. Bentley procedure.:ok.

-Checked the ISV with 12v charger and output tes procedure:ok. But when i plug the wires to the ISV the 12 V drop to 0volts

Note: The engine seems to start when someone is starting while i m pushing the distr plate with my hand !!!!

Any comments welcome.



My spelling checked at:http://chxo.com/scripts/spellcheck.php