Helpful ReplyHot!Turbo Engine Rebuild

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scam75 Guest of the Club Total Posts : 2003 Joined: 2009/08/09 10:35:30 Status: offline scam75 Guest of the Club Re: Turbo Engine Rebuild 2023/02/11 17:45:49 (permalink) Well she goes again! Ended up being the Bosch HFM-5 MAF unit that was goosed, thankfully I had a spare brand new one. It has either gone of its own free will or else it was tipped over the edge by the suspect wiring to it. We will never know! Anyway, after waiting a week for Royal Fail to lose my new plug which should have been 24 hour delivery, I ventured to the scrappy today, how that brought back memories! I needed a 5 pin Bosch MAF plug so found a Golf and removed one. Slightly different looking, but 5 pins, and Bosch, of course it will fit! It didn't. So I then set about making it fit, and changing all the wires over, so I know I have 2 good ends on that harness now. Fired it up, same, starts and dies, also battery starting to go flat and Mrs about to leave for an overnight with the kids in her car with her ready 12v supply for jump starting. Asked her to wait 5 mins as I dug out the new MAF and did an F1 style change over, fired it up with all the hose clamps still loose and wires all over the place, and off she went! Joy! Then off she went, with the kids, and while it was still running I got all the wires in order, done up all the hose clips and refitted the snorkel. Good old test drive and can report all beans are present. I have a slightly better idle AFR of 14.5 (low 14's before MAF swap) and WOT AFR of low 12's. This is the first time since the rebuild I've buried the throttle and kept it there, 4th gear, just under 20psi boost falling to 18psi as you do with an MBC, many leptons showing on the speedometer on my private road. No bangs or noises or fluids lost and all perfectly clear out the back of the tailpipe. Got to be happy with that. I'll probably change over that plug for the proper one when it finally arrives, but for now it should be fine and all the wiring is good. Possibly the new MAF, or the wires now not being ropy, have led to the better idle AFR, who knows, but all is as it should be now! Time for beer! Stuart '90 944 Turbo - Sunroof delete, Factory bridge spoiler, CS wheels, CS steering wheel, 1st MY90 turbo in UK Promax L2 chips, SciVision MAF, Lindsey DPW, MBC, Forge recirc valve, 3 bar FPR, K&N panel, GAZ Gold, wideband AFR, Sytec Motorsport Fuel Pump. Quote Reply #241
blade7 Guest of the Club Total Posts : 2502 Joined: 2008/06/06 12:28:26 Status: offline blade7 Guest of the Club Re: Turbo Engine Rebuild 2023/02/11 21:38:30 (permalink) Good news . Quote Reply #242
TTM Guest of the Club Total Posts : 2866 Joined: 2004/04/20 21:10:42 Location: Fetchez la vache Status: offline TTM Guest of the Club Re: Turbo Engine Rebuild 2023/02/12 10:28:45 (permalink) Congratulations, good job well done, and enjoy! Quote Reply #243
scam75 Guest of the Club Total Posts : 2003 Joined: 2009/08/09 10:35:30 Status: offline scam75 Guest of the Club Re: Turbo Engine Rebuild 2023/02/27 10:19:33 (permalink) Thanks! A couple of hundred trouble free miles since the new MAF and wiring fix. The new loom plug finally arrived but have not fitted it yet, no rush as the other not quite right plug is doing just fine. AFR's all still good and now covered 1,900 miles since the build. Not lost a drop of oil and it is still beautifully golden. Had to add small amounts of coolant but this was due to a small air lock when i let it idle when bolting up all the boost pipes the other week, was spitting out the overflow a bit. Been fine and not lost any since. Stuart '90 944 Turbo - Sunroof delete, Factory bridge spoiler, CS wheels, CS steering wheel, 1st MY90 turbo in UK Promax L2 chips, SciVision MAF, Lindsey DPW, MBC, Forge recirc valve, 3 bar FPR, K&N panel, GAZ Gold, wideband AFR, Sytec Motorsport Fuel Pump. Quote Reply #244

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