When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Longer version:
Got all the exhaust and airboxes installed first. no issues besides CEL. Got the Weistec W.3 Turbos installed and had major issues, cylinders dying, limp mode, misfires... turns out weistec sent the wrong spark plugs. Went back to stock plugs, found the turbo waste gates werent done right as well, less issues, but still some misfires, so the tuner dialed back the boost because he saw the misfires as coming from light AFR. Sitting at 18.5 psi boost right now with no issues, but I want to push it back up. Im seeing many builds over 20 PSI without any mention of fuel starvation. My tuner thinks pushing it back up will just start causing misfires again, that upgrading the low pressure fuel pumps and modifying the high pressure rails is needed. Am i missing something? is my tuner missing something?
any help, ideas, opinions appreciated! pic of my baby
Last edited by Chadwick F.; Apr 18, 2019 at 01:24 PM.
I had a similar issue as you and it ended up being one of my high pressure fuel pumps was on its way out. On stock tune and boost level the car ran completely fine but once it was tuned it would fuel cut and go straight into limp mode at high rpm, normal cruising was perfect. I replaced both high pressure pumps and was good to go. Theres a way in star I believe to log fuel pressure at the rail while driving this will tell you if its a fueling issue. You should be able to run more than 19psi also check for any boost or vacuum leaks.
Mine is at 21 PSI
I have P008A code show up once a while. And it will be gone after driving for 20 mins.
Checked with Tech, he said my fuel pump is good.
He has no idea why P008A shows up.
Longer version:
Got all the exhaust and airboxes installed first. no issues besides CEL. Got the Weistec W.3 Turbos installed and had major issues, cylinders dying, limp mode, misfires... turns out weistec sent the wrong spark plugs. Went back to stock plugs, less issues, but still some misfires, so the tuner dialed back the boost because he saw the misfires as coming from light AFR. Sitting at 18.5 psi boost right now with no issues, but I want to push it back up. Im seeing many builds over 20 PSI (Pure turbos claiming 25 PSI even) without any mention of fuel starvation. My tuner thinks pushing it back up will just start causing misfires again, that upgrading the low pressure fuel pumps and modifying the high pressure rails is needed. Am i missing something? is my tuner missing something?
any help, ideas, opinions appreciated! pic of my baby
Do this put the car on dyno and connect a fuel pressure gauge on it and see where the fuel pressure is sitting at. It could be the low side giving out due to thr built in filter which gets dirty. It could be high pressure pumps too. what code do you get ? Fuel pressure to low?
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
