Low Idle |
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jdstocks
Newbie Joined: 10-February-2005 Status: Offline Points: 11 |
Topic: Low Idle Posted: 10-March-2005 at 03:12 |
Latest news – Yesterday I took the car back to where I had the LPG conversion done about a year ago. The LPG system is fine; however their diagnostics did pickup that the right hand (looking at the engine from the front) lambda sensor was not working. There was no signal on the screen for this sensor, whereas on the left bank there was a nice square wave. So, could this be the cause of all my trouble? Does anybody know where on the car these are located? How difficult are they to change? Is it worth doing both at the same time? Thanks |
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jdstocks
Newbie Joined: 10-February-2005 Status: Offline Points: 11 |
Posted: 07-March-2005 at 07:54 |
Thanks guys for trying to help. eta. I would like to take up the offer from your wife's cousin and don't mind the drive upto York. Could you please let me know contact details and a convenient date/time. |
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ChippedUKbro
Banned User Joined: 22-February-2005 Status: Offline Points: 40 |
Posted: 07-March-2005 at 06:20 |
Thats an excellent opertunity, it would be worth the drive to fix the problem as i am sure people will try it on if you go to a garage blind.
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eta.
Really Senior Member II Joined: 21-October-2002 Location: United Kingdom Status: Offline Points: 599 |
Posted: 07-March-2005 at 06:00 |
If you can part with your car for a while, my wife's cousin is a very expierenced/qualified technician with lpg conversion knowledge too. You can completely trust him not to rip you off. He is near York though.
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ChippedUKbro
Banned User Joined: 22-February-2005 Status: Offline Points: 40 |
Posted: 07-March-2005 at 04:55 |
Here is jays reply. I trully think that the problem is with an electrical fault on the lpg conversion, i spoke to a company who do this conversion and the current accross the injectors can send the wrong signal to the dme causing rough idle. I also think taking it to bmw may be a problem as they are almost certainly going to blame the lpg conversion and you will end up with a massive bill and no fix. On the other hand it is possible it is just a bad earth on the engine (again given by advice from another company) I will get his number for you and hopefully you can have a chat with him and see how it goes. |
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jdstocks
Newbie Joined: 10-February-2005 Status: Offline Points: 11 |
Posted: 07-March-2005 at 04:23 |
OK guys, here's the latest on the problem. I visited Jayson on Saturday morning and he kindly did a free, diagnostic on the car. The results showed a lot of misfiring on various cylinders and a fault with the EWS. The misfiring is exactly what I get when cold starting, but I’ve never heard of the EWS. He reset the EWS and the idle went from about 300rpm up to the normal 700rpm. I took the car for a quick 10 minutes drive around the block and returned back to Jayson’s. When parked up the idle seemed steady at 700rpm. Unfortunately by the time I had got home (about 80 miles) the problem had reappeared. I’m not really sure what this means. Is the EWS broken and needs replacing? I’m wondering myself whether there are 2 separate faults here. #1 the cold starting problem and #2 the low idle. Another symptom I’ve noticed is when slowing down for a junction or to stop, the engine revs are always above 1000rpm as it changes down automatically. As I continue to slow down below about 35mph, suddenly the revs will drop almost to zero and the battery light will quickly flash before the revs pickup slightly to the 300rpm level. Could someone on the forum please advise what is supposed to happen here? I would imagine the normal behaviour is for the engine revs never to fall below the idle rate of 700rpm as it changes down. I’m now thinking I may have to ‘bite the bullet’ and take it to a BMW dealer. My nearest is Murketts in Huntingdon. Are these any good? Thanks Jayson for your time and effort. Sorry it’s not better news. |
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ChippedUKbro
Banned User Joined: 22-February-2005 Status: Offline Points: 40 |
Posted: 05-March-2005 at 15:22 |
I beleive he went to Jayson at ChippedUK.com and got the work done.
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robs e23
Really Senior Member I Joined: 28-January-2005 Location: colchester essex Status: Offline Points: 498 |
Posted: 05-March-2005 at 14:46 |
at a price
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eta.
Really Senior Member II Joined: 21-October-2002 Location: United Kingdom Status: Offline Points: 599 |
Posted: 04-March-2005 at 08:56 |
Bavarian are closing in April. They are selling loads of parts (probably very cheaply). I have put a post on the board for contact details. I'm pretty sure one of them runs a e38 750. I know they are very helpful and will do anything to get a 7 running right.
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ChippedUKbro
Banned User Joined: 22-February-2005 Status: Offline Points: 40 |
Posted: 04-March-2005 at 08:33 |
If you give Jayson a call on 07815-501867 he will do you a full, free, diagnostic on the car so you will know for sure what is wrong. He is based in Birmingham. |
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jdstocks
Newbie Joined: 10-February-2005 Status: Offline Points: 11 |
Posted: 04-March-2005 at 07:59 |
Sorry, what does MAFM mean?
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J7 VNK
Really Senior Member I Joined: 24-May-2004 Location: United Kingdom Status: Offline Points: 450 |
Posted: 04-March-2005 at 06:38 |
Try for the air leak! a very possible cause IMO check for splits in the rubbers boots connecting the MAFM etc. to the manifiold, you have 2 IIRC |
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1999 528iA Sport Pack,Aspen Silver,17" MTech's. 1994 525i Sport, Avus Blue,SOLD (BMWCC Member) 1999 323i SE E46, Black, man, Sports Leather. My Cars "BMW's are for life, not just for Christmas" |
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jdstocks
Newbie Joined: 10-February-2005 Status: Offline Points: 11 |
Posted: 04-March-2005 at 04:24 |
Many Thanks eta. I think my engine is an e38 if that makes any difference.
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eta.
Really Senior Member II Joined: 21-October-2002 Location: United Kingdom Status: Offline Points: 599 |
Posted: 04-March-2005 at 04:17 |
Trying to get info on BAP as their website not loading. Will advise ASAP. Hope they are still around in one shape or form as they know the e32 inc 750 inside out.
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Chas C
Really Senior Member II Nothing new under the sun Joined: 15-December-2004 Location: Aberdeenshire Status: Offline Points: 1620 |
Posted: 03-March-2005 at 07:06 |
Looks like BAP is no more Patrick.. Martin has put up an announcement on the 7 register this morning... |
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Wiseass
Banned User Joined: 02-March-2005 Location: America Status: Offline Points: 15 |
Posted: 03-March-2005 at 05:48 |
The sneaky way to check air leaks is.....
Get a can of intake/throttle body/carb/etc cleaner.. and lightly spray it on the air intake boots that run past the air flow meter. If you hear a change in engine idle speed/tone, then you found you leak. Worth a shot anyways. |
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jdstocks
Newbie Joined: 10-February-2005 Status: Offline Points: 11 |
Posted: 03-March-2005 at 05:10 |
Hi Wiseass, thanks for the advice. I have had no "CHECK ENGINE" light or any other type of warnings on the dash. If it was an air leak, how do I check this? |
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Wiseass
Banned User Joined: 02-March-2005 Location: America Status: Offline Points: 15 |
Posted: 03-March-2005 at 05:05 |
Not sure about European models, but isn't your car OBD2? Usually
bad O2 sensors will trigger a "CHECK ENGINE" type of light.
(I am under the general impression, if I recall from basic conversations that I have had with Gpower that 96+ E38s are OBD2 pretty much worldwide). If I recall it's pretty easy to test them using a multimeter yourself. Again, I am unfamiliar with the European model cars, but US-Market cars have 4 O2 sensors.. upstream and downstream of the cats, so there could be 4 to check! Still, sounds like an air leak to me.... |
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jdstocks
Newbie Joined: 10-February-2005 Status: Offline Points: 11 |
Posted: 03-March-2005 at 04:26 |
Hi eta. can't seem to find Bavarian Autoparts on the web. Do you have any other info? Thanks |
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eta.
Really Senior Member II Joined: 21-October-2002 Location: United Kingdom Status: Offline Points: 599 |
Posted: 03-March-2005 at 04:07 |
Bavarian Autoparts in the Leicester area. Come back to me if you cannot locate.
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