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talon

Won't re-start above 97 degrees

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Looking for any ideas on what would cause my 01 v8 to refuse to start when the engine temp is over 97 degrees or so. The car starts fine cold, but if you shut it off any higher than 97, it will turn over but not catch on the restart. As soon as the engine cools to below 97, it starts right up again. I'm at a loss...

Edited by talon

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97 degres (Celsius ?), hmm... . What is with overheating in fuelrail ? But wait , as the ECM normaly powers up the fuelpumps every time you switch ignition in start position there can't be a problem. It is cyrculating fresh fuel every time ...!?

Or does your pressure regulator fail ? Maybe with stay open and let pass the pressure backward to the return pipe. That would also mean no pressure for sufficient spray in start condition, ,...right !?


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Yes, celcius. I can hear the fuel pump cycle on when I try to start it... How would I check the regulator?

Edited by talon

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Yes, celcius. I can hear the fuel pump cycle on when I try to start it... How would I check the regulator?

In order as i understant the function it is not adjustable (as most aftermarket versions.) It is regulatet by plenum pressure. In high pressure range (WOT) you need more fuel. This means both pumps work together and the plenum-pressure close the return path with a membran type valve in the regulator. Effect is a higher pressure in rail. --> more fuel injectet in relation to injection time. Under start condition there is not such a plenum pressure who can close the return, so this means normaly it should stay open !? Maybe this is the reason why both pumps also work together during crank/start time (as workshop manual says..).

Workshop book refers to a manometer/ pressure gauge and test pipe; attached to the shrader valve in rail (rh-front side) if a fuel problem is mentioned. I dont know the pressure readings in the moment, maybe some others have them.. .

Also test that both pumps work together (for example- bridge the relay pins of primary and secondary pump ; in rear luggage compartment RH) if the car than starts with both pumps in steady run the problem was the low pressure in rail (of only one running pump) during start period.

And after all , i would guess it is something strange , more simple thing. As normal in Lotus life... .

Tell us your thoughts and experiences , or what it was in the end


*********************************************************************

to name the things if I see them, that's what I call integrity..

*********************************************************************

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Engine temp sensor, check this out. Only costs a few quid to buy a new one.

If you have OBDII reader you may be able to see what's happening?

I've heard this happen once on another V8 and plenty of times on other makes of cars.

The only other thing I heard was coils breaking down as they are over the engine trapped with all that heat. This was a one off though!

Dave Walters

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I am going to pick up an OBDII reader this week. Still looking around to se which one to get. I'd like something that I can connect to my laptop and use Freescan with.

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Out of luck I'm afraid. I am not aware of any OBDII reader that you can use freescan with. However, most OBDII readers come with their own software. The main problem is that they can only monitor the generic OBDII values and not the specific Lotus ones.


Dave - 2000 Sport 350

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My mistake - I meant to say interface cable instead of reader :)

I've actually been hunting around looking for a premade one, but may break down and make up my own.

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OK - I am going to check OBDII andthe temp sensor first. Who knows, maybe I'll get lucky. Since I don't have a test guage for the regulator that may be something that it has to go into the shop for. :)

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... The main problem is that they can only monitor the generic OBDII values and not the specific Lotus ones.

I can denie that! My does read P0xx and P1xx codes ( it's ordinary *Vehicle Explorer* OBD reader software with interface cable) , www.obd-2.de [Original is Alex Peper from USA] reads Data from MAP pressure over O2 voltage (all four sensors seperate) to knock sensor voltage... .

G

*********************************************************************

to name the things if I see them, that's what I call integrity..

*********************************************************************

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