200 idle probs

crisarc · 17-01-11, 07:43 PM

recent running prob on my 200 with ur 20 3b engine,
on warm up its runs for a bit then conks out, when warm it runs better, but even better with the aux air valve disconnected,

no boost leaks, new white and black pin sensors at the back of the head,
question is does the aav on the motronic have a constant power feed or does it vary?
if so what controls it?
i have also changed the aav, but to no avail, it runs ok with the aav disconnected ,,, but i need to know

oh and today the push rod on the clutch master snapped , in the middle of wolverhampton, had to use the starter to get it going and crash change it home....

oh what a day

missfire · 17-01-11, 08:00 PM

hey! don't damage that beautiful car!

phone Green Flag next time....!

missfire · 17-01-11, 08:03 PM

is this the same thing...??

http://www.isham-research.co.uk/quat..._air_test.html

k-jet one different...?

.

20vcqdriver · 17-01-11, 10:04 PM

mine was rough on starting from cold until i replaced the Lambda probe. Also are you sure non of the small vac / pressure hoses at back of inlet have perished /crushed?

crisarc · 17-01-11, 10:13 PM

the hoses are ok, all new, i disconnected the maf and it idled better, not sure about the lambda, i need to understand the system, ive had the maf and lambda in 4 years now and 50k, are the maf and lambda service items?
if so where would i go?

crisarc · 17-01-11, 10:15 PM

dont know if the k jet is the same as the motronic aav?

20vcqdriver · 18-01-11, 08:55 AM

Quote:

Originally Posted by crisarc

the hoses are ok, all new, i disconnected the maf and it idled better, not sure about the lambda, i need to understand the system, ive had the maf and lambda in 4 years now and 50k, are the maf and lambda service items?
if so where would i go?

Ah, MAF. HAd issues with mine too though in my case it would idle but as soon as I opened the throttle it died. Disconnecting the MAF will improve idle as it will cause the ECU to run on set internal parameters which sounds to me that you have either a MAF fault or other external sensor down if you can guarantee no intake leaks.

Phil Payne · 18-01-11, 09:42 AM

Quote:

Originally Posted by crisarc

recent running prob on my 200 with ur 20 3b engine, ...

Check the idle switch is engaging (so it knows it's SUPPOSED to be idling) and then pull the ECU fuses to clear all codes, restart and pull the real codes.

crisarc · 18-01-11, 08:14 PM

erm, where do i find these, idle switch, and fuses please

crisarc · 07-02-11, 08:51 PM

right, new hall senders x2, new plug leads, new rotor arm, new dizzy cap. and finally re wired the warm up sensor [white pin /back of the head], and we have a smooth idle , turns out my rotor arm, had contacted the internals on the cap , ,,, well you can imagine,[my fault, as i had not replaced it properly]
all seems well, only the maf and lambda to go ,[budget]
just as well i have aquired,,,,,,,,,,,

17-01-11, 10:04 PM	#4
20vcqdriver 4 ring whore! Classic Audi Club Member Join Date: Dec 2007 Location: Wirral Posts: 3,910	mine was rough on starting from cold until i replaced the Lambda probe. Also are you sure non of the small vac / pressure hoses at back of inlet have perished /crushed? __________________ Coupe quattro 1986:-~450bhp + loooong list of mods! Audi A7 Bi-TDI SLine Black edition 2015 mapped to produce 600lb/ft torque! Audi S4 4.2 V8 cabriolet 2004:-

17-01-11, 10:13 PM	#5
crisarc Senior Member Classic Audi Club Member Join Date: Jul 2007 Location: shrewsbury Posts: 1,172	the hoses are ok, all new, i disconnected the maf and it idled better, not sure about the lambda, i need to understand the system, ive had the maf and lambda in 4 years now and 50k, are the maf and lambda service items? if so where would i go? __________________

17-01-11, 10:15 PM	#6
crisarc Senior Member Classic Audi Club Member Join Date: Jul 2007 Location: shrewsbury Posts: 1,172	dont know if the k jet is the same as the motronic aav? __________________

18-01-11, 08:14 PM	#9
crisarc Senior Member Classic Audi Club Member Join Date: Jul 2007 Location: shrewsbury Posts: 1,172	erm, where do i find these, idle switch, and fuses please __________________

07-02-11, 08:51 PM	#10
crisarc Senior Member Classic Audi Club Member Join Date: Jul 2007 Location: shrewsbury Posts: 1,172	right, new hall senders x2, new plug leads, new rotor arm, new dizzy cap. and finally re wired the warm up sensor [white pin /back of the head], and we have a smooth idle , turns out my rotor arm, had contacted the internals on the cap , ,,, well you can imagine,[my fault, as i had not replaced it properly] all seems well, only the maf and lambda to go ,[budget] just as well i have aquired,,,,,,,,,,, __________________

17-01-11, 08:00 PM	#2
missfire making wooden things Classic Audi Club Member Join Date: Dec 2009 Location: cow land Posts: 8,156	hey! don't damage that beautiful car! phone Green Flag next time....!

17-01-11, 08:03 PM	#3
missfire making wooden things Classic Audi Club Member Join Date: Dec 2009 Location: cow land Posts: 8,156	is this the same thing...?? http://www.isham-research.co.uk/quat..._air_test.html k-jet one different...? .