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  #1  
Old January 13th, 2010, 08:36 PM
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barry f
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Distributor Vacum Advance

For the last year, my 90 has had an intermittent problem where after driving for a bit it the RPM drop to just about zero and then jump back up. It wants to stall but doesn't. Happens at traffic lights and other times. I thought it was the stepper motor or the throttle housing being dirty but it kept coming back. Well a local shop said my distributor vacuum advance unit had a split diaphragm. They replaced it and set the base idle.

My question is now when I drive and I pull up to a light or come to a stop the RPM are about 1200 for a few seconds before it drops to just under 1000. Is this normal? I don't remember it this way. I am not sure if it seems weird because the borla is so loud or because I have been driving the 110 for a long time which idles differently. I trust the shop I just don't know.

thoughts?
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  #2  
Old January 13th, 2010, 08:44 PM
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my D110 does that, especially when the engine is cold, then after it warms up not so much
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  #3  
Old January 13th, 2010, 11:19 PM
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I have such rage about this issue. Took my truck in for 60k service. I get it back and drive maybe 25 miles with the car idling like crap. I bring it back. They adjust idle while I wait and within a day I still have issue. Now I pick truck up today and this crap. I drove my 110 this afternoon to compare and when I pull up to a light it go right to about 900 rpm. There is no higher idling first. Such rage for this place.
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  #4  
Old January 13th, 2010, 11:29 PM
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Chris Davis
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They probably disconnected the battery. The ECU has some learn circuitry (I have been told) and your car sort of tunes itself for a few days. Mine does, at least. That could very well be it--see if it goes away in a few days.
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  #5  
Old January 14th, 2010, 01:00 AM
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Had a 60k service. It was the first thing done. 94 ECU like the 93 shouldn't need to reset. Plus this is a big shop and they drove it for awhile to make sure it was ok.
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  #6  
Old January 14th, 2010, 01:58 AM
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My 94 is running the 14cux ecu --I am not sure if that is the same as a 93, but I thought it was. I'll check into the reset issue--I certainly notice my idle having issues after I disconnect the battery for anything more than briefly. Since I work often on my truck, this happens fairly regularly--now I am left just wondering if it was all in my head! LOL.
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  #7  
Old January 14th, 2010, 08:58 AM
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Mine does it also, when I have been driving it for a while it does fine. I dont even notice it anymore.
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  #8  
Old January 14th, 2010, 09:23 AM
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They screwed up your base idle.
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  #9  
Old January 14th, 2010, 09:39 AM
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Thats what I thought. So much rage. Do not want to go back
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  #10  
Old January 14th, 2010, 09:56 AM
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Originally Posted by bjf View Post
Thats what I thought. So much rage. Do not want to go back

Redo it yourself.
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  #11  
Old January 14th, 2010, 12:26 PM
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barry f
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what do I need to do? Shop says it is normal
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  #12  
Old January 14th, 2010, 04:14 PM
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Talked to shop again. They claim it is ECU driven and they did the proper base idle set up (not from screw) and that the only way to fix is a new ECU but not worth doing. thoughts?
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  #13  
Old January 14th, 2010, 04:22 PM
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What happened? You hit a bump and a couple ones changed to zeros?
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  #14  
Old January 14th, 2010, 04:24 PM
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Quote:
Originally Posted by bjf View Post
Talked to shop again. They claim it is ECU driven and they did the proper base idle set up (not from screw) and that the only way to fix is a new ECU but not worth doing. thoughts?

Swap with your 110 and see if it still does it (wait three drive cycles for a verdict). Got $20 says it does.

Ron
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  #15  
Old January 14th, 2010, 04:25 PM
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barry f
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that is what they said. so it is the ecu?

is this normal?
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  #16  
Old January 14th, 2010, 06:13 PM
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Not the ECU.

Ron
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  #17  
Old January 14th, 2010, 06:16 PM
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oh just reread. so what should i do?
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  #18  
Old January 14th, 2010, 08:24 PM
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Ok, so just to make sure we're all on the same page here.

Initial problem was near stalling at traffic lights.
Shop replaced the vacum diaphram on the distributor.
Stalling problem went away.

Current problem is that idle is very high at stoplight.
Initially 1200rpm or so, then dropping to 750rpm?
This only started occuring since the work was done, and hasn't been happening long.

If that's all correct, just drive the truck. The ECU just needs to re-learn its idle curve most likely. The memory in the ECU is volatile, meaning it loses its learned info when you disconnect the power to the ECU. This is most noticed with a high idle when coming to a stop. I've had it take a week or two for the idle to settle back down again to normal.
This is normal for the ECU design, not an uncommon question here. I wouldn't worry too much about it.

-Hans
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  #19  
Old January 14th, 2010, 08:51 PM
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Have the alternator checked at an electrical specialty shop. Have them load test or voltage drop test the batery cables both positive and negative.

Need a fuel pressure test and graphing meter amp draw test of the fuel pump function as well.

Do not go back to that shop for this problem. Maybe they can help you when something else comes up. But they are in the dark here.
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  #20  
Old January 14th, 2010, 10:43 PM
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barry f
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thanks for all the info. I will give it a week then be enraged again.

------ Follow up post added January 14th, 2010 08:13 PM ------

Pendy, You had a ton of info there. Not sure my issue is that big. The shop in question is very British. One could say it is in the name. Every employee is British and drives a Rover. The owner has a Camel Trophy defender and there are tons of classics, etc there. Anyway the owner of the shop said he used to see this issue with a ton of classics. He could never get it right. He talked to a couple people at Land Rover who told him certain trucks had ECUs that did this. Not sure if it was an emissions setting or what. Said that whoever adjusted my base idle before didn't do it correctly (it was his shop last time I brought it in for this). He said they did the proper set up (cutting air to hoses or some crap) and set it up. Said the truck would drive this way and if it was his truck he wouldn't care but I could get a new ECU or a used one, etc. I don't plan to go back to them so I am either going to reset the base myself with Ron on the phone or wait and have someone else do it. The truck is running well so for now I will drive i with 5 second rage intervals at lights.
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