E30 M3 Power Loss - help required!
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Category: Technical & Model Specific Forums
Forum Name: BMW ///M Power
Forum Discription: Ask your BMW M Power Technical Questions here (M1, M2 hybrids, M3, M5 & M6)
URL: http://www.bavarian-board.co.uk/forum_posts.asp?TID=23333
Printed Date: 14-May-2024 at 23:11
Topic: E30 M3 Power Loss - help required!
Posted By: MarkD
Subject: E30 M3 Power Loss - help required!
Date Posted: 19-October-2005 at 04:12
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All sugestions welcomed - the problems is this:
Car can suddenly loose power, either when pulling away or on a steady throttle (press the throttle down and nothing, car dies and will not pull away). Back off on the throttle and go back on it and it will suddenly start working again! It did this several times this morning and annoyed the hell out of me and it could be potentially dangerous. Other things I've noted are that it prefers to do it more in damp/ wet weather or after a fuel stop - both of which I had this morning!! This problem is driving me up the wall as it's been going on for nearly a year (though it was fine in the summer). Parts that have been changed within the last year are: O2 sensor, ECU, distributor cap and rotor, injectors, airfilter, air flow meter and plugs. Fuel Filter has not been changed but will be this weekend. Could it be the TPS or something else electrical? TPS does 'click' when moved away from idle position - does that mean its working OK?? Thanks for any help. Mark |
Replies:
Posted By: M3PSM
Date Posted: 19-October-2005 at 04:23
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I'm no mechanic, but sounds to me like fuel starvation.
I had the same thing on my old 323i & it turned out to be a knackered fuel pump & blocked filter from where it had been in storage for a year before I bought it. ------------- Drive it like you stole it! ___________________________ 1995 3.0 E36 Coupe 1989 E30 325 Touring 1992 Yamaha TDM 850 www.myallracing.co.uk |
Posted By: MarkD
Date Posted: 19-October-2005 at 04:32
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Thanks for the reply - a fuel problem is my no 1 suspect after all
that was replaced last year! The car has sat around for a while in the past prior to me buying it in 2004 so maybe theres a lot of crap in the fuel tank which filling up makes worse! It's in for an MoT and Oil service on Saturday and the fuel filter will be changed at that time. If that doesn't help I'll have to start looking at other things. Mark |
Posted By: stevesingo
Date Posted: 19-October-2005 at 04:40
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Sounds like the AFM is on the blink to me. You can check it out with a multi meter but I'm not sure on which terminals to check on though. Maybe if you do a search the info will come up.
Steve |
Posted By: 215DMX
Date Posted: 19-October-2005 at 04:50
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AFM a good possibility, as well as blocked filter,
worth checking the in-tank pump under the rear seat, also worth checking the coil, and what condition are you plug leads in? Also worth seeing if you have water ingress above the glove box just in case the ecu is getting a bit damp! I have a spare working AFM if you need one. Dave |
Posted By: Nostrils
Date Posted: 19-October-2005 at 05:02
This was my problem of a few years ago, having the same symptoms!! Whatever leaked isnt now!! ------------- Phil |
215DMX wrote:Posted By: MarkD
Date Posted: 19-October-2005 at 05:09
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AFM is less than a year old (I've still got the old one - it's a Sport
Evo so it uses the different AFM). The leads were replaced within the last two years. I might try swapping in some of the old components one at a time and see if there's any difference if this problem continues after next weekends work. Just spoken to Nigel Moesley and he suggested trying disconnecting the barometric sensor or the fuel damper on the fuel pump under the rear seat. Keep the suggestions coming. Mark |
Posted By: Nick
Date Posted: 19-October-2005 at 05:18
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Mine used to do that until I changed the leads..
It wouldn't do it all the time.. but when it did it was always in a high gear just when you gave it a bit more pedal to pull away from 40 or so when the road opened up.. it felt like a cold engine with not enough choke. The new leads sorted it.. make sure you haven't nipped your leads inside the plastic lead tidy thing.. it's easily done.. in fact get rid of it and keep the leads separated from one another. ------------- |
Posted By: UweM3
Date Posted: 19-October-2005 at 05:30
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Quote from "hardtailer" ( I guy I know from the german S14 crowd)
Anyone suspecting fuel delivery problems should check wether the problem has been solved by the changing of the fuel filter alone. One check that can be done on the fuel delivery is the following: - undo the fuel return line from the fuel rail that sits on top of the engine - put a length of fuel hose on to the rail and the other end in a measuring container - pull out the fuel pump relay from behind the cover behind the expansion tank - bridge the contacts in the socket in order to operate the fuel pump. - measure the quantity of fuel that's being delivered. It should be 750cc in 30 seconds - if it's less you could perform the same test directly at the pump underneath the car on the left hand side where the pump sits. If the flow rate is ok there (should be slightly more than 1.5l/min) then you have a clogged filter. If it's too low again you need a new pump (or 2 as there is a 'pre-pump' inside the tank) to check the fuel pressure one should hook up the pressure tester in the return line. It should read at least 3.0 bar. If it doesn't, either filter is clogged, or pump/pressure regulator are defective. I had a similar problem once. The culprit was a Motronic with bad solderings for the transistors that run the injectors. Look for hair cracks with a magnifying glass and good light, resolder and you're done. Quote end. ------------- E61 520d, slow and buzzy but my wallet likes the mpg..... |
Posted By: Simon325i sport
Date Posted: 19-October-2005 at 06:18
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I had a problem with the car bogging down recently, especially when pulling away in 1st, if you didn't give much throttle, the car would be very hesitant to pull away, I recently changed the dizzy and rotor, and the problem is now non existant. ------------- 
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Posted By: 215m3
Date Posted: 19-October-2005 at 06:43
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Mark
I would take it back to Nigel and insist he gets it sorted as it has nevet run right since you bought it. He'll know this because of the amount of calls you have made to him and what has been replaced. ------------- Toby http://www.bmminiparts.com - New Genuine BMW & Mini OEM parts - www.bmminiparts.com 1987 E30 M3 with turbo being added |
Posted By: MarkD
Date Posted: 19-October-2005 at 07:21
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Toby
I will be taking it back to Nigel early next year - provided it doesn't get sorted before then! When it runs good, it's a great car, but this nagging problem has me seriously annoyed with it. Strange that it was after all the work last November that this started. I should have left the damn thing alone!! How's my old car doing anyway? Mark |