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04-04-20, 08:16 PM | #1 | |
Grown up member
Join Date: Mar 2010
Posts: 53
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MB High Idle
Hi all,
I haven't been on here for years due to other activities and interests. Anyhow my mb has developed a high idle issue that I'm struggling to resolve and could do with some more knowledgeable input. The car starts fine and idles normally until the engine gets to operating temperature and then the idle increases up to 1.5k, 2k and at its worse 3k. I initially thought an air leak was the logical culprit, however I have so far not found any. The next thought was the warm up regulator but when I disconnect the electrical plug there is no change. Any ideas and thanks in advance. |
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06-04-20, 08:58 AM | #2 |
Senior Member
Classic Audi Club Member
Join Date: Feb 2019
Location: Near an MB ur Quattro
Posts: 1,171
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Do you mean the warm up regulator (by the side of the block near the spark plugs, fuel)
or the Digital Idle Stabiliser? (top of the engine near the back by the coil, air) More likely the DIS. Unplug and see what happens. It does sound like excess air. Aloso check the throttle valve is closing properly, not spring gunked up... |
06-04-20, 06:39 PM | #3 | |
Grown up member
Join Date: Mar 2010
Posts: 53
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Quote:
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06-04-20, 07:11 PM | #4 |
Grown up member
Join Date: Feb 2011
Location: Chelmsford
Posts: 651
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To me, it seems excess fuel, not air. Might be wrong.
Excess air should make idle go up and down as "ecu" would try to stabilize it. The problem could be the fuel pressure regulator or the little sensor at the end of the engine block near the firewall. Will follow this topic to see what was wrong. |
06-04-20, 07:56 PM | #5 |
Senior Member
Classic Audi Club Member
Join Date: Dec 2013
Location: Back home in Tillicoultry
Posts: 1,308
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Hi guys, sorry but might not be much help, the last time I had high idle speed on a k-jetronic injection system, the 12v wiring plug to the warm up regulator had come off and was idling at 2,200 rpm when warmed up, make sure you have a 12v and earth at warm up regulator wiring plug, also ISV are also prone to sticking open, giving high idle speed.
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07-04-20, 11:34 AM | #6 |
Grown up member
Join Date: Mar 2010
Posts: 53
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Well, it's not doing it now.
Confused |
07-04-20, 04:19 PM | #7 | |
Grown up member
Join Date: Mar 2010
Posts: 53
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Quote:
Regards Mark. |
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08-04-20, 08:26 AM | #8 |
4 ring whore!
Classic Audi Club Member
Join Date: Nov 2007
Location: Polmont
Posts: 2,617
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On the MB the temp sender at the rear of the head is for the gauge.
csv is ecu controlled
__________________
1991 90 quattro 20v sport 1991 90 quattro |
08-04-20, 03:11 PM | #9 |
Grown up member
Join Date: Jan 2014
Posts: 218
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I had exactly this problem on my MB, caused by the ISV. I improved matters, but didn't cure them, by soaking the ISV in carb cleaner for a couple of days then flushing it out with more of same (obviously keep the electrical end out of the stuff). Loads of black gunge came out. However, my ISV was too far gone and eventually I (or rather Pete Reeve) managed to get hold of a new original one –*problem solved. BTW we'd tried less-expensive after market ISVs (apparently the correct part) but they were not fit for purpose.
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09-04-20, 02:11 PM | #10 |
Senior Member
Classic Audi Club Member
Join Date: Feb 2019
Location: Near an MB ur Quattro
Posts: 1,171
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Does teh MB have a DIS and an ISV ?
LOL, actually, am interested-which is the correct term? |
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