| Author | Message | |||||
     Ian Leonard New User Username: ian_leonard Post Number: 3 Registered: 9-2005 |
My 1990 Turbo R CH 33262, failed to proceed recently due to the engine management fuse melting. The fuse box was very hot, the person who owned the car before me put an in-line fuse in behind the fuse box, the fuse was too large and hence melted. The fuse box is now wired with a self setting circuit-breaker, the fuse and box is again cool. In my humble opinion this next problem is unrelated, before the fuse melted the orange check engine light would ignite and the car would miss fire a little. Since fixing the fuse car is now shaking on idle, more like a Ford GTHO Phase 111 than a Bentley. On starting to accelerate, the car miss fires or stutters a little then precedes as it should (very well), no problem at speed. My Mechanic has suggested the fuel injection system may need to be re-calibrated, he is an excellent mechanic but any other thoughts would be appreciated as well. | |||||
| Richard Treacy Grand Master Username: richard_treacy Post Number: 917 Registered: 4-2003 |
Have you downloaded the fault codes from the ECU ? If you don't have the procedure, I can email it to you. It takes a few minutes to check the on-board dignostics, and no tools are needed. The codes should tell you what has happened. I did this last week, and found a faulty Lambda sensor connection causing rough idle on a friend's '89 Turbo R. The Engine Check lamp came on whenever the idle was rough. With the lamp not illuminated, the idle would be rock steady and smooth at 580RPM, then for no apparent reason it would go rough and drop to 500, stalling occasionally, with the Engine Check lamp illuminated. The danger is that, even though like yours, it ran fine at speed. An intermittent fault like this can destroy the catalytic converter. As for the circuit breaker, I would revert to a fuse: breakers are too slow to protect electronics at all, even though a standard fuse is still rather slow. I had the same meltdown of the fuse (fuel injection fuse, centre fuse panel) about 4 years ago on my '87. When the socket is a little dirty, the bad joint causes electrical losses and it all heats and melts. With new socket contacts it was cured. RT. | |||||
| Ian Leonard New User Username: ian_leonard Post Number: 4 Registered: 9-2005 |
Richard, thanks for your help, it is greatly appreciated. I have not downloaded the fault codes from the ECU and don’t have the procedure. Your friends problem with the ’89 sounds the same as mine, it now idles at the lower 500 RPM and is rough, (the car rocks from side to side) and will stall occasionally. Obviously I don’t want to damage anything, the cats or anything else so I look forward to downloading the ECU codes. Will also take your advise and look into new socket contacts regarding the hot fuse problem. | |||||
| Patrick Lockyer. Grand Master Username: pat_lockyer Post Number: 474 Registered: 9-2004 |
Richard can you confirm the ECU type of memory system as i am not sure what type it uses. On some if the ECU looses the main power suppy it may go into default mode and have to learn again, also it may not store the flash codes. This can be a prob depending on type,CAM memory etc. Regarding the rough running at low engine speeds the fuel pressure regulator is a common failing as are the injectors. Regarding the the self setting circuit breaker don't like that at all powering up the management system but maybe the mechanic knows something that i still have to learn. The larger fuse that blew after heating up the fuse box points as stated is usally due to a high resistance this must be rectified first. | |||||
| Patrick Lockyer. Grand Master Username: pat_lockyer Post Number: 475 Registered: 9-2004 |
Just to add on the common possible injector faults. Worth carrying out first putting some injector cleaner through the system, your mechanic will probably know the trade method not in the manual. If not get back to me. | |||||
| Hameed Noor Mohamed Yet to post message Username: hameednoor Post Number: 1 Registered: 12-2006 |
richard treacy - can you download faults without any tools?? BTW I have had rough idle and misfire on my 1990 silver spur II. Put a bottle of STP fuel system cleaner and it seems to work. After one tankful the misfire seems to have disappeared. However still I have some hesitation on starting moving with the ac on. | |||||
| Richard Treacy Grand Master Username: richard_treacy Post Number: 1143 Registered: 4-2003 |
In an edition to be posted on the RROC(A) Technical Manual there is a table of the blink codes. This diagnostic allows you to read out Motronic faults from the dashboard. See the attached. I shall dig up more detail later.
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| Richard Treacy Grand Master Username: richard_treacy Post Number: 1145 Registered: 4-2003 |
OK, I messed up the last file. Here are the ones I intended to post.
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| Patrick Lockyer. Grand Master Username: pat_lockyer Post Number: 633 Registered: 9-2004 |
This may help with the above ilistrations. A quick fix to restore the k-motronic ecu will be to disconect the battery for a short time say 30 seconds. This can be done to reset the fault code or codes to start at the begining,know to many codes that are not relevent that show up after one real problem has caused them to BLINK. Ist test blink code shown 4.4.3.1 = idle speed control= actuator open or short ciruit! 2nd blink 2.3.4.4 mixture control unit rich to its limit = threshold limit of 14 mA exceeded. Beware! Good techs will use diagnostic equipment to test sensors. Bad ones will read a code and replace what's not needed. A typical example is the front and rear O2 sensors going bad at the same time on some cars. Codes are set, sensors replaced, and codes return. In a real world both O2 sensors seldom are going bad at the same time while a hole in vacuum tube will set off the code. | |||||
| Richard Treacy Grand Master Username: richard_treacy Post Number: 1146 Registered: 4-2003 |
Another version:
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| Hameed Noor Mohamed New User Username: hameednoor Post Number: 2 Registered: 12-2006 |
Thanks for the info. | |||||
| Hameed Noor Mohamed New User Username: hameednoor Post Number: 4 Registered: 12-2006 |
Sometimes when I turn the key to my 1990 silver spur II to on, a checking systems light comes on and then there is a red battery symbol as well as the oil symbol. I have a new alternator and my mechanic says the current is OK. Oil level is ok. What could be the problems - Thanks |
