97' MGF Mk1 cuts out in the heat
On hot days (and I mean Aussie hot days not what most of you Poms would call hot) my car will sometimes just cut out. this usually happens after the car has been parked for a sort while, then when I go to take off from the first traffic light it coughs and splutters then dies.
If I open the boot for a few mins to let the heat out it will then start Ok and be no further trouble.
The engine bay fan appears to start and stop as it's supposed to in fact I've added 2 small extraction fans to the engine fan circuit, they're mounted to the engine cover grill and they do pump out quite a bit of hot air from the engine bay. But the problem still persists in spite of them.
As I understand it the diagnostic system is bloody near useless on MEMS 1.9 ECUs and as this problem is intermittent every time I go near the car with a multimeter the car behaves itself and works perfectly.
I do have a bloody huge Bosch Diagnostic Engine Analiser in the shed but it's going to be a pain in the bum to try and simulate the conditions in the shed.
So I'm hopeful that someone here might have a clue as what the cause might be, although I realise as most of you wouldn't get the weather conditions that seem necessary for the problem to occur, your unlikely to have had the same problem happen to you.
BTW, I didn't fit the extraction fans to try and solve the cutting out problem, I fitted them because of how hot it gets in the engine bay in our climate, I'm worried that all the wiring insulation, hoses and electrics wont last as long as they other wise would in a more hospitable environment.
The fans I used came from an agricultural quad bike with a water cooled engine.
They look a lot like computer fans but they're water resistant.
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something is expanding in the heat
BILSTIEN DAMPERS, 4-2-1 MANIFOLD, HEAD WORK BY SABRE.
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"Keep calm, relax, focus on the problem & PULL THE BLOODY TRIGGER"
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- David Aiketgate
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- David
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Replied by David Aiketgate on topic 97' MGF Mk1 cuts out in the heat
Posted 11 years 3 months ago #109452David
:shrug:
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Like something electronic breaking down in the heat, a sensor, ECU or even something the interfaces with the ECU like the imobiliser etc.
Like the heat soak from recently running combined with the hot weather causing a problem that goes away once it's had a chance to cool a little.
The worry is that one day it will stay broken, probably a long way from my workshop!
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- rough luck
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Replied by rough luck on topic 97' MGF Mk1 cuts out in the heat
Posted 11 years 3 months ago #109462Youtube channel of mods an track pics
http://www.youtube.com/user/busternorris?feature=mhum
Website: http://www.roughluckracing.com/ MG Rover Mobile Repairs Nationwide and Western Europe
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Sometimes it'll start again straight away but as soon as you put it in gear it falters and stops again but if you let it cool for a few minutes then restart it's fine and other times it won't restart until it's cooled for a few minutes then it's OK.
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- rough luck
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Replied by rough luck on topic 97' MGF Mk1 cuts out in the heat
Posted 11 years 3 months ago #109465Fuel, either filter, pump, relay behind the ECU or the fuel shut off relay
Ignition not plugs or leads as that would be a multiple fail of parts but Coil packs or distributor
wiring/ECU could be the boot wiring shorting out to earth or the ECU wiring
it could be the ecu temp sensor tripping it on to choke but I wouldn't have thought it would stop it running
I guess its just try a few and see
Youtube channel of mods an track pics
http://www.youtube.com/user/busternorris?feature=mhum
Website: http://www.roughluckracing.com/ MG Rover Mobile Repairs Nationwide and Western Europe
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"Keep calm, relax, focus on the problem & PULL THE BLOODY TRIGGER"
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Don't move the TR7, it probably needs a rest. Maybe you could try one of these gadgets hooked to your phone or laptop on the go. They are cheap! I have ordered one ,it hasn't turned up yet so not sure how it all works??
http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=360604575939&ssPageName=ADME:L:OU:AU:3160
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- David Aiketgate
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- mgf mk2 freestyle mpi 16" wheels, in Anthracite.
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Replied by David Aiketgate on topic 97' MGF Mk1 cuts out in the heat
Posted 11 years 3 months ago #109521Only mems3 is OBD2 compliant.
David
:shrug:
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