getting frustrated with this 20V!!!! (drivability issues)
Thread Starter
AudiWorld Senior Member
Joined: Aug 2001
Posts: 1,396
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getting frustrated with this 20V!!!! (drivability issues)
1990 90 20V Q early build
the symptom: car runs PERFECTLY when its cold.....has ALL its power, revvs nicely.....
then...FIVE minutes later when it JUST starts warming up, it feels like it looses 70 HP.....and revvs like it has a 90 LB flywheel.....WTF?....then the car has full power again from 6000 to 7200 RPM....
what i have done: i have another 90 20V parts car that was running perfect until i was rearended....so i know all its parts work...
replaced with working parts/new parts:
-distributor and hall sender in dist.
-cap & rotor
-plugs and wires
-timing belt and waterpump
-coolant temp sensor in the back of the head
-MAF
-radiator and condenser
-whatever temp sensor thats in the bottom of the radiator
-O2 sensor
the car had these symptoms before these parts were instaled......dont think im just throwing $$$ at it as most of the parts were free
compression test as follows:
cyl1 = 210 PSI
cyl2 = 200 PSI
cyl3 = 200 PSI
cyl4 = 210 PSI
cyl5 = 190 PSI
the engine was at full operating temp when performed, and i didnt have time to do a wet test.....the plugs also are new and lookes good when pulled....
HELPPPPP!!!
the symptom: car runs PERFECTLY when its cold.....has ALL its power, revvs nicely.....
then...FIVE minutes later when it JUST starts warming up, it feels like it looses 70 HP.....and revvs like it has a 90 LB flywheel.....WTF?....then the car has full power again from 6000 to 7200 RPM....
what i have done: i have another 90 20V parts car that was running perfect until i was rearended....so i know all its parts work...
replaced with working parts/new parts:
-distributor and hall sender in dist.
-cap & rotor
-plugs and wires
-timing belt and waterpump
-coolant temp sensor in the back of the head
-MAF
-radiator and condenser
-whatever temp sensor thats in the bottom of the radiator
-O2 sensor
the car had these symptoms before these parts were instaled......dont think im just throwing $$$ at it as most of the parts were free
compression test as follows:
cyl1 = 210 PSI
cyl2 = 200 PSI
cyl3 = 200 PSI
cyl4 = 210 PSI
cyl5 = 190 PSI
the engine was at full operating temp when performed, and i didnt have time to do a wet test.....the plugs also are new and lookes good when pulled....
HELPPPPP!!!
AudiWorld Super User
Joined: Oct 2001
Posts: 9,703
Likes: 0
Have you downloaded the blink codes? The codes will ....
steer you in the right direction. 20V engines are very fussy and will
not run right unless you find the EXACT problem. Have you ohm checked the MTF sensor at the back of the block? Is the speed sensor the exact ohm rating? Anything less than the stated specs and you will start experiencing problems. Have you checked the resistance of the injectors thenselves?
not run right unless you find the EXACT problem. Have you ohm checked the MTF sensor at the back of the block? Is the speed sensor the exact ohm rating? Anything less than the stated specs and you will start experiencing problems. Have you checked the resistance of the injectors thenselves?
Thread Starter
AudiWorld Senior Member
Joined: Aug 2001
Posts: 1,396
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ok.....pulled codes....
replaced all injectors, FPR, fuel filter.....i have to go see how it runs later
blink codes for MAF, 2 knock sens. codes.....
knock sensors are next on list.....
then thoes 2 sensors @ the back of the block
blink codes for MAF, 2 knock sens. codes.....
knock sensors are next on list.....
then thoes 2 sensors @ the back of the block
AudiWorld Super User
Joined: Aug 2002
Posts: 14,898
Likes: 0
I got those same codes . . .
replaced both knock sensors AND MAF, didn't help me, I hope it helps you. We seem to be having the same symptoms and are getting the same codes, I hope one of us figures this out.
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Thread Starter
AudiWorld Senior Member
Joined: Aug 2001
Posts: 1,396
Likes: 0
weird.....i have replaced EVERY single sensor except
for the 2 sensors on the back of the block, the knock sensors.....
i have more low-end torque than before with my new injectors.....and fuel filter.....
this is getting very annoying.....
im just going to wait till the car cools compleately tomorrow and then replce thoes engine block sensors with known working ones....
WHY couldnt we just have MOTRONIC?!?!?
i have more low-end torque than before with my new injectors.....and fuel filter.....
this is getting very annoying.....
im just going to wait till the car cools compleately tomorrow and then replce thoes engine block sensors with known working ones....
WHY couldnt we just have MOTRONIC?!?!?