Stranger starting issue once warmed up, please help?
Moderators: GRNSHRK, ron, bfons
Stranger starting issue once warmed up, please help?
89 635csi
The car starts no problem when cold. But once hot it takes 2 or 3 times to start. It will always start and does no problem but only on the 2nd or 3rd time when hot.
Any ideas?
The car starts no problem when cold. But once hot it takes 2 or 3 times to start. It will always start and does no problem but only on the 2nd or 3rd time when hot.
Any ideas?
Re: Stranger starting issue once warmed up, please help?
Mine's started to exhibit similar hot start characteristics, so I'll be following this thread with interest
Phil
__________________________
1988 Highline 635 CSi
__________________________
1988 Highline 635 CSi
Re: Stranger starting issue once warmed up, please help?
When it wont start, does it fire a few cylinders and then die, or does it not start at all? Does giving a little throttle help? How does it run otherwise? and how is the idle? It could be the idle control valve staying open, or possibly another vacuum leak.
Another phenomenon is a heat soak where the gas in the fuel lines vaporizes. This is common in aircraft engines that have constant flow injectors, but in theory this shouldnt happen in the FI system in our cars. But a bad check valve or injector could cause this.
Other issues with the various sensors could cause the car to think it is cold starting when in fact it is hot.
this is a great resource that explains the FI system very well.
http://www.hiperformancestore.com/Motronic.htm
Another phenomenon is a heat soak where the gas in the fuel lines vaporizes. This is common in aircraft engines that have constant flow injectors, but in theory this shouldnt happen in the FI system in our cars. But a bad check valve or injector could cause this.
Other issues with the various sensors could cause the car to think it is cold starting when in fact it is hot.
this is a great resource that explains the FI system very well.
http://www.hiperformancestore.com/Motronic.htm
1985 635CSi Diamondblack/Llama
1991 750iL (sold)
1991 750iL (sold)
Re: Stranger starting issue once warmed up, please help?
That link has been dead for a while.wogden700 wrote: ↑Sun Apr 12, 2020 1:03 pm When it wont start, does it fire a few cylinders and then die, or does it not start at all? Does giving a little throttle help? How does it run otherwise? and how is the idle? It could be the idle control valve staying open, or possibly another vacuum leak.
Another phenomenon is a heat soak where the gas in the fuel lines vaporizes. This is common in aircraft engines that have constant flow injectors, but in theory this shouldnt happen in the FI system in our cars. But a bad check valve or injector could cause this.
Other issues with the various sensors could cause the car to think it is cold starting when in fact it is hot.
this is a great resource that explains the FI system very well.
http://www.hiperformancestore.com/Motronic.htm
1986 635csi LOCUTUS / Arktis Blau Metallic / Pearl Beige / S38B36/ Close ratio dogleg 5sp
2002 E46 M3 / Topaz Blau Metallic / Black Nappa / 6 speed SMG software tuned / Bilstein PSS10 Coilovers / CMP RACP reinforcement
2002 E46 M3 / Topaz Blau Metallic / Black Nappa / 6 speed SMG software tuned / Bilstein PSS10 Coilovers / CMP RACP reinforcement
- 86_6series
- Platinum Member
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- Location: West Nyack, NY
Re: Stranger starting issue once warmed up, please help?
It worked for me Baders
86-635CSi
96-MB C220 SOLD
98-740i
71-Continental MK3
96-MB C220 SOLD
98-740i
71-Continental MK3
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- Joined: Sat Apr 11, 2020 1:35 am
- Location: Redwood City, CA
Re: Stranger starting issue once warmed up, please help?
So did anyone have a list of possbile things to check?
My '84 is in the same boat..starts perfectly and instantly runs to redline if asked...until it has about 20 miles and engine warms up. As long as you're cruising, runs great. But when you pull up to a stop sign the engine starts bucking and trying to stall...and finally stalls and won't start.
Let it get cold and same all over again. Dangerous in traffic so need to know what to test
My '84 is in the same boat..starts perfectly and instantly runs to redline if asked...until it has about 20 miles and engine warms up. As long as you're cruising, runs great. But when you pull up to a stop sign the engine starts bucking and trying to stall...and finally stalls and won't start.
Let it get cold and same all over again. Dangerous in traffic so need to know what to test
Greg Hutchinson
'84 633CSi with 478K miles
'81 Euro 635CSi needing assembly
www.airheadadventure.com
'84 633CSi with 478K miles
'81 Euro 635CSi needing assembly
www.airheadadventure.com
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- Joined: Fri Nov 18, 2016 11:40 pm
- Location: Liverpool uk
Re: Stranger starting issue once warmed up, please help?
Hi
Get your Injectors serviced. Then using the Bentley Manual check the Fuel Pump Delivery and the Fuel Pressure Gauge.
Good look
Get your Injectors serviced. Then using the Bentley Manual check the Fuel Pump Delivery and the Fuel Pressure Gauge.
Good look
Ronnie
Liverpool uk.
1986 635csi.
Bronze Beige Metallic.
Liverpool uk.
1986 635csi.
Bronze Beige Metallic.
Re: Stranger starting issue once warmed up, please help?
Follow the link in my previous post. It will help you to diagnose the issue. It helped me when I had a vacuum leak last fall.
1985 635CSi Diamondblack/Llama
1991 750iL (sold)
1991 750iL (sold)
Re: Stranger starting issue once warmed up, please help?
Weird !! Definitely doesn't work for me.
1986 635csi LOCUTUS / Arktis Blau Metallic / Pearl Beige / S38B36/ Close ratio dogleg 5sp
2002 E46 M3 / Topaz Blau Metallic / Black Nappa / 6 speed SMG software tuned / Bilstein PSS10 Coilovers / CMP RACP reinforcement
2002 E46 M3 / Topaz Blau Metallic / Black Nappa / 6 speed SMG software tuned / Bilstein PSS10 Coilovers / CMP RACP reinforcement
Re: Stranger starting issue once warmed up, please help?
Don't want to go off topic here but I cant get that link to work either...weird as it comes up on google search but cant get a link to the hiperformancestore to work - maybe a timing thing..... will try later...
E46 M3
K1300R
Looking for M635CSi
K1300R
Looking for M635CSi
Re: Stranger starting issue once warmed up, please help?
Same for me - tried it all kinds of ways and no joy!
Phil
__________________________
1988 Highline 635 CSi
__________________________
1988 Highline 635 CSi
- 86_6series
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Re: Stranger starting issue once warmed up, please help?
Here it is in a word doc.
Maybe this will work.
Maybe this will work.
86-635CSi
96-MB C220 SOLD
98-740i
71-Continental MK3
96-MB C220 SOLD
98-740i
71-Continental MK3
-
- Bigcoupe Contributor
- Posts: 323
- Joined: Wed Sep 10, 2014 12:08 am
- Location: Arden, NC 28704
Re: Stranger starting issue once warmed up, please help?
89 635CSiA (11/88 build)
AlpineWeiss II (218)/Natur(0200)
87 L6 635CSI Sold
87 MB 560SL Sold
AlpineWeiss II (218)/Natur(0200)
87 L6 635CSI Sold
87 MB 560SL Sold
Re: Stranger starting issue once warmed up, please help?
It works for me on my Android, My Chromebook and even on the Mac at work (shh dont tell).
1985 635CSi Diamondblack/Llama
1991 750iL (sold)
1991 750iL (sold)
- hornhospital
- Platinum Member
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- Location: Silverhill, AL
- Contact:
Re: Stranger starting issue once warmed up, please help?
Same here. Worked on three laptops, two tablets and my smart phone. Not sure why you can't open it.
Ken Kanne
'84 633CSi "Sylvia"; '85 635CSi "Katja";'85 325e "Hazel Ann"; '95 M3 "Ashlyn"
'84 633CSi "Sylvia"; '85 635CSi "Katja";'85 325e "Hazel Ann"; '95 M3 "Ashlyn"
Re: Stranger starting issue once warmed up, please help?
I guess it's probably down to the browser that I'm using - Microsoft Edge.
Phil
__________________________
1988 Highline 635 CSi
__________________________
1988 Highline 635 CSi
Re: Stranger starting issue once warmed up, please help?
Perfect, thanks86_6series wrote: ↑Mon Apr 13, 2020 12:12 pm Here it is in a word doc.
Maybe this will work.
Bosch Motronic Basic Motronic 1.1 1.2 1.3 Fuel Injection Technical Article.doc
Phil
__________________________
1988 Highline 635 CSi
__________________________
1988 Highline 635 CSi
Re: Stranger starting issue once warmed up, please help?
Yep this worked - brilliant and thanks!86_6series wrote: ↑Mon Apr 13, 2020 12:12 pm Here it is in a word doc.
Maybe this will work.
Bosch Motronic Basic Motronic 1.1 1.2 1.3 Fuel Injection Technical Article.doc
E46 M3
K1300R
Looking for M635CSi
K1300R
Looking for M635CSi
Re: Stranger starting issue once warmed up, please help?
Given that all the vacuum lines on my car are the originals from 1988, I guess now would be a good time to replace them!!
I'm being a bit lazy here, but do BMW sell vacuum pipe by the metre or in specific part no lengths?
I'm being a bit lazy here, but do BMW sell vacuum pipe by the metre or in specific part no lengths?
Phil
__________________________
1988 Highline 635 CSi
__________________________
1988 Highline 635 CSi
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Re: Stranger starting issue once warmed up, please help?
My first guess would have been fuel pump pressure check valve. When warm/bad they can allow pressure to bleed down rapidly and make starting hard. An open throttle will help when warm. When cold the engine is aided by the cold start injectors etc so starting is easier.
Re: Stranger starting issue once warmed up, please help?
I’ll try this seems easy, any idea how to install?Rondel Fan wrote: ↑Tue Apr 14, 2020 5:23 pm My first guess would have been fuel pump pressure check valve. When warm/bad they can allow pressure to bleed down rapidly and make starting hard. An open throttle will help when warm. When cold the engine is aided by the cold start injectors etc so starting is easier.
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- Location: North East
Re: Stranger starting issue once warmed up, please help?
I may have gotten ahead of myself. If I searched correctly some years may have one, and some may not, as least on the pump. Here is what it might look like.
https://images.app.goo.gl/U8TUhiYxLJkoZQd29
Basically mounted on top of the outlet side of the pump, between the pump body and the banjo fitting.
https://images.app.goo.gl/U8TUhiYxLJkoZQd29
Basically mounted on top of the outlet side of the pump, between the pump body and the banjo fitting.