Hi Rob,
Is that radiator the Chinese one? I bought one and sent it back and made them build a proper one. They now have modified side tanks that are level with the top of radiator and the fan shroud screws are level with the core like the original. They are built fairly well from the look of the one arrived. Cheers Scott |
Yes its Chinese. I had to modify the attachments to hold the fans, ie. cut them off.
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After swapping the engine, it would start fine and run for about 30 seconds then slowly die, regardless of the amount of throttle. i discovered the front harness blue/green and green/white wires were badly deteriorated. So I swapped harnesses, but the problem persists. Starts fine settles to a idle, then idle keeps dropping to a stall.
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I disconnected the Hall and temp sensors. Same condition. Starts then stalls. It's running pig rich. The green diode on the clear relay when it stalls.
Any hints? |
check the spark plug wires for proper routing,
keep an eye on the cats if they are glowing red then its dumping lots of unburned fuel into them, so you have an ignition issue, probably a coil wire shorted out on a piece of metal. NOTE red hot cats will ignight the body shutz pull the vacuum lines off the damper and smell for fuel any that are leaking will flood the engine |
Originally Posted by rufrob
(Post 15375833)
I disconnected the Hall and temp sensors. Same condition. Starts then stalls. It's running pig rich. The green diode on the clear relay when it stalls.
Any hints? Ah - one other thing to check as I made an assumption above.. when you swapped engines, did you also swap the temp sensors for the ignition monitoring system off the 89 engine? 87/88 didn't have them. They screw into M12 threaded ports just below the exhaust outlets at the manifold. They would have been on cylinders 4/8 on the '89 engine, altho factory moved them to 3/7 from 90 onwards (so that's where I'd install them - system is otherwise the same). If you did put them on the earlier engine, I'd also check they're connected properly. |
The 89 engine had them removed and I bypassed the ignition relay.
While checking the FPR and tps and cps and distributor I found the coil wire not seated due to wrong connector. Cranked it and it started and didnt stall. Plugged in the MAF and it stalled. Swapped the MAF and it ran better not perfect. Guess the plugs are soaked. |
89 temp sensors
did you also swap the temp sensors for the ignition monitoring system off the 89 engine? 87/88 didn't have them. They screw into M12 threaded ports just below the exhaust outlets at the manifold. They would have been on cylinders 4/8 on the '89 engine
anyone have pics and or part #'s for these? |
Neither cars I had had those components. I simply bypassed the relay to get it running.
What I don't understand is with the bad engine I didn't have the problem and all the components are for the most part the same. I pulled the plugs this morning, which didn't look too bad. I cleaned and reinstalled them. It no longer stalls but runs only marginally better. Still very rich and or a terrible miss. I know the wires are weak but again, it ran before. Now I'm hearing a rattle from the torque tube, which I rebuilt, at low idle. |
Originally Posted by rufrob
(Post 15379309)
Neither cars I had had those components.
Time to bust out the Troubleshooting LH/EZK section of the WSM, in the back of VOlume 1A. Page D24-9 is the start of the test plan, and you should pretty much go through each of the tests there, although first check 2 items which I don't think that plan covers.. 1. The right Coding plug is attached 2. If its a car coded for cats, that the O2 sensor is attached - or if its a non-cat car, or you're using a non-cat coding plug, O2 sensor should not be connected, and instead a bridge between 2 of the pins installed, and also the 1kohm potentiometer attached to the 3-pin Bosch connector in the footwell to provide MAF calibration to an exhaust gas analyser. Then walk through all the tests and see what passes or not. I would recommend testing at the LH connector, to make sure the issue isn't a short in the wiring which you had to piece back together from a very hacked-up state. |
Hi Hilton,
Thanks for the input. It has the proper coding plug. It has cats but the 02 sensor is not connected, but the plug hasn't been bridged. I think the ignition is the issue since for sure there is fuel. |
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Correcting the crossed 6&7 wires did it now she starts and idles fine. Next find out what's causing the rattle from the mid rear of the drivetrain. But before that...
While filling the June bought radiator from EBay Leak!! The car refuses to get done!!! |
Well this is it for the time being. This car as eaten up every spare minute since May.
lets hope the JB Weld holds This engine sounds a lot better than the other https://photos.app.goo.gl/dumDKP2RkhzpB3st7 |
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So here it is.
1989 Porsche 928 S4 VIN: WPOZZZ92ZKS841153 98,000km Black on Black Sunroof Leather interior, except dash board 5 litre 32valve motor 4 speed automatic transmission List of work done: Engine swap due to thrust bearing failure on original motor Thrust bearing end flow 0.2mm on used 88 engine #M28/42 81H05845 Timing belt Water pump Front cam shaft seals Front and rear crank shaft seals Flywheel bolts Oil pan gasket Left and right head gaskets 32 valve seals Timing belt tensioner boot and gaskets Oil filter Spark plugs Low pressure Power steering hose Alternator clean and voltage regulator check Cleaned and painted fuel injectors New front and rear fuel hoses Air pump delete and head port plugs Used front wiring harness Rebuilt MAF sensor 2 new knock sensors New radiator with atf and engine oil cores Rebuilt torque tube bearing Transmission torque converter cover bearings New transmission fluid hoses Transmission filter and fluid Rebuilt instrument cluster wiring hardness Cleaned CE Cleaned power window motors and regulators New steel braided brake hoses Brake pads and rotors well within specs. New fuel pump, bypassed in-tank pump All electrics work except for Air Conditioning. To make it perfect: Slight rattle from the torque tube, possibility shifter bearings. Dent on left front wing near side marker Rear bumper clear coat peel Minor dent on left and right rear fenders Small rust around rear glass Missing engine under guard Oil pressure gauge doesn't work due to digital dash/2 prong oil pressure sender incompatibility ABS light on due to deteriorated wiring connectors I will try to address some of those issues the longer I have it. Reason for sale is a change in my career requires me to be away. I won't have time to address the remaining issues. I really and truly love the 928. But it's not practical for me to keep it. I have photos and parts receipts of all the work done. https://photos.google.com/share/AF1Q...F6YUZSNG9FZ2VB |
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