1997 2.8 roadster (auto) keeps stalling at roundabouts and will not restart until engine has cooled down after 30 minutes

stackwadd

Dedicated Member
British Zeds
Joined
Jan 21, 2014
Messages
17
Location
Lancaster
Model of Z
Z3 2.8
Help Please. My 2.8 Auto Roadster (89,000 miles) keeps letting me down, usually at busy traffic intersections! It has the M52 B28 engine.

I have been towed home by the AA three times in the last week. There are no fault codes showing, and no dashboard lights on at all. I have had a professional mechanic change the fuel pump with a quality replacement pump along with a new fuel pump relay. Car starts and runs beautifully. Then once it has warmed up, it stalls and will not restart. The battery is healthy. Cranking strongly. Sometimes, once cooled down, it will start again and seems to run fine for a while, only to repeat the previous behaviour - usually at busy roundabouts. I am now in a position that I cannot trust the car at all, as I know it will let me down sooner or later usually in a dangerous spot.

The last AA man suggested maybe the ECU box could be suspect as the fault manifests itself when warm and then reinstates once cooled down. He suggested (maybe) a solder weakness on printed circuit board inside the unit. Please can anybody suggest what I could do next to resolve this? I am totally out of ideas, and have already spent quite a lot trying to get this fixed. There were no fault codes whatsoever showing when I had a diagnostic done on professional equipment. I cannot use the car anymore until I get this sorted.
 

t-tony

Zorg Expert (II)
Supporter
British Zeds
#ZedShed
Joined
Dec 31, 2013
Messages
43,293
Location
Torksey Lock,Lincoln, England
Model of Z
E89 Z4 23i Auto
I would suspect the inlet camshaft position sensor is faulty. When mine failed on my 2000 2.0 the symptoms were remarkably similar.

Tony.

ps. Do not use cheap aftermarket (eBay) items. Use only OEM quality part if you change it, or swap it with a “known” good one.
 

stackwadd

Dedicated Member
British Zeds
Joined
Jan 21, 2014
Messages
17
Location
Lancaster
Model of Z
Z3 2.8
Thank you for your reply Tony. I will follow up on your suggestion.

Kind regards

Mark
 

Robert Hill

Zorg Legend
Joined
Sep 17, 2018
Messages
626
I sent my ECU to ECU testing and had it rebuilt with lifetime guarantee it was collected from my home on the Monday and returned on Friday plugged it in and have never had any problems cost £350 including vat and delivery look them up on YouTube
IMG_20200808_141232.jpg
 

stackwadd

Dedicated Member
British Zeds
Joined
Jan 21, 2014
Messages
17
Location
Lancaster
Model of Z
Z3 2.8
Thank you for your post Robert. That is very useful. Your car looks the business.

Kind regards

Mark
 

NZ00Z3

Zorg Guru (IV)
Supporter
New Zealand Zeds
Joined
Dec 9, 2014
Messages
1,293
Location
Timaru, New Zealand
Model of Z
3.0L, 2.8L, 2.0L Z3 Roadsters
When it refused to start, does the rev-count bounce up a bit when you are cranking? It should do. If it does not, then your crank sensor is failing.
 

stackwadd

Dedicated Member
British Zeds
Joined
Jan 21, 2014
Messages
17
Location
Lancaster
Model of Z
Z3 2.8
Thanks for the post NZ00Z3. It is appreciated. I will check this next time it fails.
 

137699

Zorg Addict
Joined
Jan 30, 2020
Messages
216
Just noticed this is posted in the "Z3 M" section for S50/S54 3.2 litre engine cars - you might get a better response if you move it to the non-M section.
 

stackwadd

Dedicated Member
British Zeds
Joined
Jan 21, 2014
Messages
17
Location
Lancaster
Model of Z
Z3 2.8
Zorg Addict. Thanks for your comment. I have copied it over to the non-M section. Unfortunately I somehow managed to post it there twice!
 

guyglemieux

Dedicated Member
Canadian Zeds
Joined
Oct 31, 2020
Messages
115
Location
St. Jerome, Province of Quebec
Model of Z
Z 3
I once had a car that would stall on me once it warmed up. I was a bit at my wits end when my father-in-law suggested that the distributor coil can break down when too hot. Sure enough changed it and no more problems. This is just a thought I had.
Good Luck.
 
Top