Engine cutting out.
Discussion
QBee said:
I haven't had the problem since I had the stepper changed last year for a different reason - my old one went faulty when hot. After I had the car decatted and the Clive Y inserted the problem was so bad it was stalling on leisurely gear changes. Rob checked all the settings, then said to himself "it MUST be the stepper", swapped in a spare one and the problem was solved.
Last night my seat was one stop too far back, I started the car and let the clutch in too fast, and stalled it. Two goes to restart it, and the ECU was confused. It stalled a couple more times, so I held it on the throttle until it untwisted the ECU's knickers a bit and held its own idle. After that it tried to stall another couple of times, but after 15 miles it was all working 100%.
So if it persists, first thing to do is take the stepper apart and clean it. And if you and your TVR guy cannot solve it, try changing the stepper.
That is what I think - anyone know better?
I get the same sometimes. After a start from cold and first drive, revs on closed throttle rise to 1200. Then sometimes revs drop to 200 and can stall unless I catch it on the throttle. When engine is fully warmed up its no problem. Feels like a "Lazy" Stepper communicating lazily with a "Lazy" ECU. Last night my seat was one stop too far back, I started the car and let the clutch in too fast, and stalled it. Two goes to restart it, and the ECU was confused. It stalled a couple more times, so I held it on the throttle until it untwisted the ECU's knickers a bit and held its own idle. After that it tried to stall another couple of times, but after 15 miles it was all working 100%.
So if it persists, first thing to do is take the stepper apart and clean it. And if you and your TVR guy cannot solve it, try changing the stepper.
That is what I think - anyone know better?
Have cleaned Stepper nose and given internal assembly a good squirt of WD40. Seems somewhat better now fingers crossed. Will disassemble Stepper (according to the Blitz method) and give it a good clean and thin lube sometime. Have given the plug connection a squirt of Servisol electrical contact cleaner.
May eventually decide to try a new Stepper. Have read there are some duff Chinese jobs out there. Where can I get a good more reliable GM one?
I thought closed throttle of 1200 rpm was normal when on the move to sustain revs during gear changes. But not when you stop.
Mine does it when stationary unfortunately until the engine is warm, but only for a few seconds before dropping back. I put it down to a suspect speedo converter signal to ECU. Sometimes hunts between 1200 and 1800 rpm too when cold!
Mine does it when stationary unfortunately until the engine is warm, but only for a few seconds before dropping back. I put it down to a suspect speedo converter signal to ECU. Sometimes hunts between 1200 and 1800 rpm too when cold!
The 1200 rpm is fine - it is the ECU and stepper sorting out the idle whilst avoiding stalling - they all do that sir.
I had the 1800 rpm issue for a while, and we faffed around with adjusting things and restricting the zig zag pipe between stepper and throttle, but in the end a proper remap by one Mr M Adams resolved all that for me.
I had the 1800 rpm issue for a while, and we faffed around with adjusting things and restricting the zig zag pipe between stepper and throttle, but in the end a proper remap by one Mr M Adams resolved all that for me.
Tri2Tri said:
Does the Lucas ECU reset itself everytime you switch engine off? After my repair just wondering if i need to disconnect something to let the ECU reset itself.
Not sure, but sometimes, to make sure, it pays to disconnect the ECU completely (very easy, ignition OFF, just unclip the big connector from the black box, it's next to the battery), and then re-connect it. Takes a few seconds...,.I think I've f***ed mine up somehow...
It had a slight misfire when warm, after reading through a few posts on here I decided to swap out the Coolant temp sensor. The one on there was the plastic bodied one and when I took it out it looked dull and tired. A had a new shiney one from these guys
http://www.autoelectricalspares.co.uk/temperature-...
At the same time I also disconnected the ECU to rejig some of the cabling in the footwell.
Now, it runs like a three legged dog!! It wouldn't start unless I turned it over for ages and with gas pedal to the floor. Then when it did run it sounded like it wasn't firing properly, ran lumpy, loads of backfiring and wouldn't hold idle.
Any suggestions? I missed Sunday Service at MB world this morning because of it
It had a slight misfire when warm, after reading through a few posts on here I decided to swap out the Coolant temp sensor. The one on there was the plastic bodied one and when I took it out it looked dull and tired. A had a new shiney one from these guys
http://www.autoelectricalspares.co.uk/temperature-...
At the same time I also disconnected the ECU to rejig some of the cabling in the footwell.
Now, it runs like a three legged dog!! It wouldn't start unless I turned it over for ages and with gas pedal to the floor. Then when it did run it sounded like it wasn't firing properly, ran lumpy, loads of backfiring and wouldn't hold idle.
Any suggestions? I missed Sunday Service at MB world this morning because of it
Mine was just like that yesterday morning. It objected to being left out in the rain the previous night, started on about 5 cylinders, wouldn't hold an idle, and stalled at a major A road junction and wouldn't re-start.
It had the hump so badly that it had set the fuel pump part of the immobiliser, but not the rest. Fortunately, Mat Smith, TVR expert, was on the end of his phone and suggested that might be the problem
Restarted, warmed it up properly and then gave it a good thrashing
It had the hump so badly that it had set the fuel pump part of the immobiliser, but not the rest. Fortunately, Mat Smith, TVR expert, was on the end of his phone and suggested that might be the problem
Restarted, warmed it up properly and then gave it a good thrashing
1983. Alfasud. Blew a head gasket. Took it to the Alfa dealer for diagnosis and change of gasket. Got car back, started it, ran appallingly rough, couldn't get it out of second gear, took it back.
They took it apart and found a bent distributor shaft. Tried to blame me. Told them to fix it.
They had banged the distributor by accident while taking the head off..... Apparently easily done. Did you do similar?
What did you do in the footwell wiring, by the way? Is the ECU connector properly seated?
They took it apart and found a bent distributor shaft. Tried to blame me. Told them to fix it.
They had banged the distributor by accident while taking the head off..... Apparently easily done. Did you do similar?
What did you do in the footwell wiring, by the way? Is the ECU connector properly seated?
So this weekend I've been trying to get the bugger running correctly. It got to the point where it wouldn't even start, just turned over coughing and spluttering. I put the old temp sensor back in, cleaned the stepper (which wasn't that dirty) pulled all the ignition components apart and eventually boiled it down to..........
PLUG EXTENDERS!!
Surprisingly, these aren't even that old. Bought them from ACT about 9 months ago. With them off, runs like a dream, starts first time. Pop them all back on again and it barely starts. I'm making sure of good solid connections on each lead and each plug, well away from the manifold too.
Not sure if there's a way to miss them out entirely, the shrouds get VERY close to the exhaust manifold without the extenders.
PLUG EXTENDERS!!
Surprisingly, these aren't even that old. Bought them from ACT about 9 months ago. With them off, runs like a dream, starts first time. Pop them all back on again and it barely starts. I'm making sure of good solid connections on each lead and each plug, well away from the manifold too.
Not sure if there's a way to miss them out entirely, the shrouds get VERY close to the exhaust manifold without the extenders.
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