VHPD Engine Woes!

Topics relating to the series 1 Exige
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jonnyfox
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Re: VHPD Engine Woes!

Post by jonnyfox » Thu Aug 22, 2019 8:00 pm

Good call by Keith as well. I managed to flood mine, ran an 2 cylinders till I yanked the spark plugs out and gave them a clean.
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Re: VHPD Engine Woes!

Post by trackrod » Thu Aug 22, 2019 8:30 pm

Gets engine running gradually worse while warming up or is it more of a sudden change? The ECU runs in open loop while being cold and switches to closed loop mode once the engine reaches a certain temperature (closed loop: ECU tries to control mixture and ignition by looking at the current lambda readings).
Lots of things can go wrong there (bad lambda probe, air leaks, etc.). You may think of hooking up an OBD scanner to see what the ECU is doing. Check the 'sorting VHPD drivability' thread for more details.

Klaus

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Re: VHPD Engine Woes!

Post by winthattt » Thu Aug 22, 2019 10:49 pm

trackrod wrote:
Thu Aug 22, 2019 8:30 pm
Gets engine running gradually worse while warming up or is it more of a sudden change? The ECU runs in open loop while being cold and switches to closed loop mode once the engine reaches a certain temperature (closed loop: ECU tries to control mixture and ignition by looking at the current lambda readings).
Lots of things can go wrong there (bad lambda probe, air leaks, etc.). You may think of hooking up an OBD scanner to see what the ECU is doing. Check the 'sorting VHPD drivability' thread for more details.

Klaus
Klaus,

That is exactly why I asked my questions. Not sure if you have this saying in Germany, “great minds think alike, and fools seldom differ”. We are thinking the same! Keith

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Re: VHPD Engine Woes!

Post by tlracer » Thu Aug 22, 2019 11:34 pm

OBD scanner, as Klaus recommends, should hopefully give you a steer with any errors that flag up. Also I'm wondering if, as the fault only occurs once the engine's hot, whether heat is affecting a wire ( eg. injector cable ) causing a bad connection or a break to open up?

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Re: VHPD Engine Woes!

Post by Fonzey » Fri Aug 23, 2019 11:29 am

S1Exige wrote:
Thu Aug 22, 2019 6:17 pm
Fonzey wrote:
Thu Aug 22, 2019 2:51 pm
Where is it in East Yorks? If you don't mind saying :thumbup:
Burton Pidsea area but it's nobody on this forum or who has any connection with Lotus.
Fair enough, thought there may have been a local specialist that had slipped under my radar :mrgreen:

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Re: VHPD Engine Woes!

Post by S1Exige » Fri Aug 23, 2019 11:44 am

winthattt wrote:
Thu Aug 22, 2019 7:42 pm
How long does it run OK for and what is the reading on the water temp when it starts to run badly? Is it really running on three (which cylinder is cutting out) or is it just running really rough. I ask the questions because it makes a difference to determining what’s wrong.

Keith
Hi Keith

I've been told once it gets to temperature, it drops down to 3 cylinders, misfires and runs like a bag of spanners..........i've not witnessed it running but they say it's also running very lumpy compared to usual...…...that's basically all that I know plus they've replaced some parts that haven't made any difference...….i'm thinking liner heights ?

The same company did the first rebuild which lasted 2wks and it was cyclinder 1 that failed (liner cracked) piston 1 was also replaced for the second rebuild.
AKA M7EXG

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Re: VHPD Engine Woes!

Post by winthattt » Fri Aug 23, 2019 8:19 pm

So it’s lumpy all the time and as it gets warm it gets worse? When they say running on three the just mean it is lumpy and is missing some firings. Does it back fire and make bangs out if the exhaust? Is that a better description, I know it’s hard to say as you are going on what they have said to you. Very different problem if it’s always rough and gets worse.

Keith

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Re: VHPD Engine Woes!

Post by trackrod » Fri Aug 23, 2019 10:29 pm

winthattt wrote:
Thu Aug 22, 2019 10:49 pm
... Not sure if you have this saying in Germany, “great minds think alike, and fools seldom differ”. We are thinking the same! Keith
Keith, I don't think we have that saying in Germany in full length, only half of it: 'Zwei Trottel - ein Gedanke'.
Unfortunately it corresponds to the second part of the English saying.

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Re: VHPD Engine Woes!

Post by S1Exige » Sun Aug 25, 2019 10:38 am

winthattt wrote:
Fri Aug 23, 2019 8:19 pm
So it’s lumpy all the time and as it gets warm it gets worse? When they say running on three the just mean it is lumpy and is missing some firings. Does it back fire and make bangs out if the exhaust? Is that a better description, I know it’s hard to say as you are going on what they have said to you. Very different problem if it’s always rough and gets worse.

Keith
They say from start up to temperature, it runs fine.............once at temperature, it drops to 3 cylinders, misfires out of the exhaust was their description and it won't pick up revs.
I'm hoping to pop down this week tofind out for myself.

Cheers
Graham
AKA M7EXG

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Re: VHPD Engine Woes!

Post by seriouslylotus » Sun Aug 25, 2019 1:22 pm

Cut your losses and take it to somewhere else!!!

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