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Wont Rev


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#1 simon9115

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Posted 14 December 2007 - 06:04 PM

hi there, my car will start no problem but wont rev up past 2450-2500. Is this a problem witth the relay for the engine management. its a 92 1.3i spi cooper.

#2 Jammy

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Posted 14 December 2007 - 06:20 PM

Moved to Injection.

#3 Sprocket

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Posted 15 December 2007 - 02:00 PM

I would check that the fuel filter has been replaced

I may be a few things so we could ideally do with a bit more information.

Have you checked the usual maintenance items?

#4 simon9115

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Posted 10 January 2008 - 04:56 PM

I have a 1992 spi 1.3 mini cooper. About a year ago i had some exhaust work done and the garage managed to set the cat on fire, a couple of days later my battery started to kepp running low and eventually i bought another one an put cut off in the boot. the battery will run down over about 36 hours if i dont turn the cut off to off. Anyway no the car wil only rev up to 2500 and then revs up and down on its own even if you keep the throttle in the same position, reardles of being in or out of gear. I think there may be a problem with the ECU, any ideas??

I have read a few posts here but have not found any answers as of yet thats why i have started a new topic

Thanks

Simon

#5 simon9115

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Posted 10 January 2008 - 05:02 PM

Its hard to explain really. It will start up with no problem but just spits and farts for awhile then once warm after a few mins it runs grand just wont go past 2500 revs. Ask me some specific questions and i will try and answer them the best i can because i am a bit slow really.

I had no computer there for a couple of weks cause i left it down the country whilst visiting friends.

Regards
simon.

#6 Manx Mini....

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Posted 10 January 2008 - 07:09 PM

Its hard to explain really. It will start up with no problem but just spits and farts for awhile then once warm after a few mins it runs grand just wont go past 2500 revs. Ask me some specific questions and i will try and answer them the best i can because i am a bit slow really.

I had no computer there for a couple of weks cause i left it down the country whilst visiting friends.

Regards
simon.


Hi Simon,

In response to your enquiry, Yes I did fix it. I changed the entire wiring loom and ecu for that of an earlier cooper. Its still going now. I never found the cause though, I can only assume it was an ecu fault.

Regards
John.

#7 simon9115

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Posted 10 January 2008 - 10:17 PM

FROM SPROCKET



Battery drain could be anythig. if its anything to do with the Injection system its either or the ECU or Relay pack. The ECU can be tested at specialist garages.

As for your problem with overheating cats and running problems, with it being a 92 spi, first place i would look is the throttle switch. Make sure the carpets are not in the way of the throtle pedal and switch. If they are clear, the switch may well be faulty. Replace the switch, they are about £14 sor so from MiniSpares.
Do not drive the car untill this is fixed, and if you have been the cat may well have melted and is now adding to the issue because it is partialy blocked.

Hope that helps

#8 simon9115

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Posted 30 January 2008 - 11:12 PM

I took out the ECU an stuck it in the hotpress for a day.I reconnected it then and the car started fine,a wee bit spluttery and worked fine for about 5 to 10 mins and then the same problem again

IS there any reason this worked for a couple of mins and then reverted back???

#9 simon9115

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Posted 07 February 2008 - 02:42 PM

hello there?

Anyone got any ideas?

#10 DaveRob

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Posted 07 February 2008 - 04:25 PM

Have you replaced your melted CAT yet....

#11 BoyracerAU

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Posted 08 February 2008 - 11:54 AM

I'm curious. I've read about the possibility of melting a cat. I thought cats were porcelain.

Can someone explain what happens when a cat melts?

Why it happens?

And, how can you tell if your cat is melted?

#12 Sprocket

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Posted 08 February 2008 - 04:29 PM

throttle pedal switch??

#13 Sprocket

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Posted 08 February 2008 - 04:51 PM

I'm curious. I've read about the possibility of melting a cat. I thought cats were porcelain.

Can someone explain what happens when a cat melts?

Why it happens?

And, how can you tell if your cat is melted?


The throttle pedal switch on the early SPi was there to tell the ecu that the engine was idling. As the driver depresses the accelerator pedal, it then tells the ECU that the engine is now in a driving condition. If the switch is stuck and telling the engine it is idling and the driver depresses the accelerator, the engine speed rises, but the ECU is trying to maintain 850 rpm. The ECU backs off the stepper and if the engine speed does not drop, the ECU then backs off the ignition advance. It is this situation, high revs and retaded ignition that causes the inlet backfire, combustion in the cylinder is incomplete and continues in the exhaust where it melts the cat

Cats do indeed melt, the matrix is so thin that when in this situation, the ignition retards so much, combustion takes place in the exhaust the cat acts like a mantle of a gas lamp, its kind of a flame trap. There is a term my engine mapper uses which i found a little funny, Thermo Rich, lol. As the cat matrix is so fine it doesnt take mutch to melt them when abused. It is quite common in the motor trade. It partialy or totaly blocks the exhaust thus asphyxiating the engine.

http://www.car-sound...4failures02.asp

#14 simon9115

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Posted 12 February 2008 - 11:33 AM

Hi yes i put a new cat replacement pipe in and checked the throttle switch but still no change.I then took out the ecu and dilmantled it and put it in the hotpress for a weekmand when i put it back together and put in the car hey presto it worked fine, but only for about 5 or 10 mins.

I think now that there may be a problem with that little pipe thing that fits onto the ecu between the two connectors.

Any ideads
Thanks

#15 BoyracerAU

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Posted 12 February 2008 - 11:53 AM

The vacuum lines and elbows are the easiest of all things to be sure of. They're probably the cheapest to replace too. Good luck sussing it out. If your MAP sensor is clear, then hopefully it's only the vacuum lines that need fixing.

Good luck with it, Simon.

And thanks to Sprocket for the explanation about cats. I'm learning heaps on this forum!




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