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S4s boost problem - Induction/Turbo/Chargecooler/Manifold/Exhaust - The Lotus Forums - Official Lotus Community Partner Jump to content


S4s boost problem

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Hi guys,

Need some help troubleshooting an over boost condition on my S4s - under WOT and high RPM the ECU is cutting the fuel due to too much boost. Boost gauge pegs and then quickly drops to zero just as ecu cuts fuel.

I've checked the wastegate hoses for leaks and found nothing, disconnected the wastegate solenoid and she runs a pretty steady 0.65 BAR under all conditions, which I believe rules out the capsule?

I took the wastegate soleniod off the car and it looks grimy and the foam filter has pretty much fallen apart. So, I'm thinking it sounds more of an electrical vs mechanical boost issue. I was going to replace the wastegate solenoid next, good idea, bad idea, any suggestions or help appreciated!



Paddle Faster, I hear Banjos!
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Swapped the wastegate solenoid, added all new hoses/clamps - problem fixed!

Paddle Faster, I hear Banjos!
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  • 2 weeks later...

I hada similar problem with a SE Turbo

every time with full trottle (after3 seconds) boost cut down

check the heath of your charge cooler

if it is to warm your impellor has to be replaced.

after replacing mine the problemwas solved.

Mind you ! If your going to do it yourself : it is going to take your full day off

Also check your O2 sensor (but then you schould have a faulty code ((33 ??)))

gr Rens

researche is something i do when i don't know what the hell i'm doing

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