If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
Flat Spot
Hi,
My car has developed an annoying flat spot at very low revs, just as you let the clutch off it hesitates & then picks up this is around 850-950 rpm. This makes for jerky or even stalling at pull away in stop start traffic, unless you rev it to 1000rpm then its ok, if it was just that I might live with it but there is another side to it that is really annoying. As your going along in traffic at about 40mph if you ease off the accelerator a bit & then the traffic speeds up & you push the accelerator (softly or hard) the car stumbles like a kangaroo stutter which is driving me mad. Now before I give money away I want to know this, could a re map of the ECU fix this problem? The reason I'm being so cautious is that I phoned up 2 separate BMW Independents & ,without seeing the car, they told me it would need the Dual-Mass Flywheel changing & it was not a flat spot!??!! I then took the car to another Independent & he has told me its definitely NOT the flywheel,he in fact laughed out loud when I told him what had been said, it was in fact a fuelling problem, coupled with (excuse the Pun) there is some wear in the Prop exaggerating the flat spot. So I thought I'll have the Prop overhauled & have the ECU Re mapped , but will they be able to stop this ?? THANKS IN ADVANCE FOR SOME KNOWLEDGEABLE IN PUT JOE |
Ads |
#2
|
|||
|
|||
"joe" > wrote:
>Hi, > >My car has developed an annoying flat spot at very low revs, just as you let >the clutch off it hesitates & then picks up this is around 850-950 rpm. - snip stuff > >I then took the car to another Independent & he has told me its definitely >NOT the flywheel,he in fact laughed out loud when I told him what had been >said, it was in fact a fuelling problem, coupled with (excuse the Pun) there >is some wear in the Prop exaggerating the flat spot. i traced my "prop wear" to a worn outer CV joint. I could hear a slight clunk as i engaged first, from stopped. In my case that would be the clutch drag too! I have heard that the flexible coupling or guibo (between prop-shaft and gearbox) can also fail with age.. how old is your car? keith |
#3
|
|||
|
|||
1994! I've contacted a local firm that rebuilds & balance's Props ,so if it
gets a bit warmer soon I'll take the Prop off & let them rebuild it . There is a slight clunk from the middle of the car if you listen hard & drop the clutch a bit quickly ,I've also realised now that at 60-70mph threes a very slight vibration so its all pointing to the Prop , not cheap but at least its not as serious\Expensive as the BMW garages made out. I had a clutch kit fitted 66,000 miles back when it had to have a replacement engine, the clutch is so light & smooth , these garages only lose custom & get a bad name by all this lying. "keith" > wrote in message ... > "joe" > wrote: > > >Hi, > > > >My car has developed an annoying flat spot at very low revs, just as you let > >the clutch off it hesitates & then picks up this is around 850-950 rpm. > - snip stuff > > > >I then took the car to another Independent & he has told me its definitely > >NOT the flywheel,he in fact laughed out loud when I told him what had been > >said, it was in fact a fuelling problem, coupled with (excuse the Pun) there > >is some wear in the Prop exaggerating the flat spot. > > i traced my "prop wear" to a worn outer CV joint. I could hear a > slight clunk as i engaged first, from stopped. In my case that would > be the clutch drag too! > > I have heard that the flexible coupling or guibo (between prop-shaft > and gearbox) can also fail with age.. how old is your car? > > > keith > |
#4
|
|||
|
|||
joe wrote: > 1994! I've contacted a local firm that rebuilds & balance's Props ,so if it > gets a bit warmer soon I'll take the Prop off & let them rebuild it . > > If indeed it is the prop it might just be the rubber guibo. I don't know how much work it is to replace the centre bearing but I'd guess not much. The prop should come balanced from the factory. It could be the flywheel though, at least in part. ...or engine mounts or similar. On another car I have a garage diagnosed a "missing centre bearing" and quoted UKP 325 (~US600) for a recon propshaft. Actually it was just the rubber bearing support that had degraded and cost UKP 15 for a new one. In fact, all that's there right now is a loop of old fuel pipe. |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
flat towing instructions | [email protected] | Jeep | 44 | February 7th 05 06:51 AM |
Run Flat tire question | H and A | Corvette | 36 | January 16th 05 01:56 PM |
driving on flat tyre ? | NC | Alfa Romeo | 4 | January 7th 05 11:23 AM |
83 prelude flat spot | JZ | Honda | 1 | November 12th 04 02:31 PM |