greenv8s help me
Discussion
hi ya,reading some posts i see your not a fan of the stepper motor can you give me a a run down of disconnecting the stepper ie when to unplug it and if i have to block the by pass hose or reset the ecu,you are my last hope but i do need a idiot proof way of doing this.hopefully this works and i can enjoy the car after 4 years of owning it.the prob i have is a intermitant cut out sometimes its ok for 2 weeks next its every junction cuts out.i have bought a new stepper made no difference any help would be great ,thanks .jay .
i did this
I just started mine...got it up to temp (80 odd deg and then just disconnected the plug to the stepper with the engine running.
Before i did this sometimes the car would run fine...other times the engine would pulse rev to 2k and then die down again and other times it would stall.
The only trouble i have now is that when it is really cold you need to keep the revs up a bit using the accelerator.
I just started mine...got it up to temp (80 odd deg and then just disconnected the plug to the stepper with the engine running.
Before i did this sometimes the car would run fine...other times the engine would pulse rev to 2k and then die down again and other times it would stall.
The only trouble i have now is that when it is really cold you need to keep the revs up a bit using the accelerator.
Jay,
All you need to do is get it up to running temperature with a nice even tick over and then unplug the stepper motor and that's it.
You must do it with the engine still running as the motor will probably park to it's default
position at switch off.
You may find that the engine will be ticking over rather slowly when the engine is cold for the first mile or so and then it should behave. (you may need a little heal and toe to stop it stalling)
Cheers
Paul.
All you need to do is get it up to running temperature with a nice even tick over and then unplug the stepper motor and that's it.
You must do it with the engine still running as the motor will probably park to it's default
position at switch off.
You may find that the engine will be ticking over rather slowly when the engine is cold for the first mile or so and then it should behave. (you may need a little heal and toe to stop it stalling)
Cheers
Paul.
As the others have said - just get it up to temperature and idling steadily then disconnect.
Something to watch out for - some people who've left it like this long term have found that the stepper motor can gradually creep over time and the revs may gradually go up or down. As a temporary way of running for a day or two just to prove whether it cures the problem, it's fine. If you decide you want to run it like this permanently then you may need to consider replacing the stepper motor with a fixed restriction, or block the bypass hose completely and raise the base idle to compensate.
Something to watch out for - some people who've left it like this long term have found that the stepper motor can gradually creep over time and the revs may gradually go up or down. As a temporary way of running for a day or two just to prove whether it cures the problem, it's fine. If you decide you want to run it like this permanently then you may need to consider replacing the stepper motor with a fixed restriction, or block the bypass hose completely and raise the base idle to compensate.
I cleaned the stepper motor and the idle was then wrong. It would slow to about 1200 rpm, then speed up briefly to about 1600rpm then slowly drop to about 800rpm where it would remain.
I originally asked Dream Machines and was told that if the stepper motor has been disconnected it must be set up again. I did as instructed and all was well, stupidly forgot to write the procedure down.
Recently went through the same procedure again and asked Chris Baldock at James Motor Sports (he is ex workshop manager for Walldonway ex TVR main dealer).
When told the procedure I remembered it from before to be the same so I'm thinking it must be right.
Procedure is;
With engine at operating temparature,
Disconnect stepper.
Ignition on for 10 secs (do not start engine).
Connect stepper.
Ignition on for 10 secs (do not start engine).
Ignition off for 10 secs.
Restart engine.
Interestingly Chris Baldock also told me that it is best to clean the throttle pot with carb cleaner at the same time;
Remove the pipe that links the Stepper motor to the throttle pot and clean it out,
Remove the pipe that connects the air flow meter to the throttle pot.
Screw the base idle screw right in, recording the number of turns. Then remove it.
Clean the hole that it sits in and also the butterfly and neck around it using a bit of rag to soak it up so not much goes into the engine.(Mine had a fair bit of gunge here)
Reassemble making sure the idle screw is wound right down and then out by the number of recorded turns.
It sounds a lot but only took about 1/2 hour and now idles perfectly.
Strange that the re setting procedure is not mentioned in the Bible
I originally asked Dream Machines and was told that if the stepper motor has been disconnected it must be set up again. I did as instructed and all was well, stupidly forgot to write the procedure down.
Recently went through the same procedure again and asked Chris Baldock at James Motor Sports (he is ex workshop manager for Walldonway ex TVR main dealer).
When told the procedure I remembered it from before to be the same so I'm thinking it must be right.
Procedure is;
With engine at operating temparature,
Disconnect stepper.
Ignition on for 10 secs (do not start engine).
Connect stepper.
Ignition on for 10 secs (do not start engine).
Ignition off for 10 secs.
Restart engine.
Interestingly Chris Baldock also told me that it is best to clean the throttle pot with carb cleaner at the same time;
Remove the pipe that links the Stepper motor to the throttle pot and clean it out,
Remove the pipe that connects the air flow meter to the throttle pot.
Screw the base idle screw right in, recording the number of turns. Then remove it.
Clean the hole that it sits in and also the butterfly and neck around it using a bit of rag to soak it up so not much goes into the engine.(Mine had a fair bit of gunge here)
Reassemble making sure the idle screw is wound right down and then out by the number of recorded turns.
It sounds a lot but only took about 1/2 hour and now idles perfectly.
Strange that the re setting procedure is not mentioned in the Bible
Edited by tvr keith on Thursday 19th April 07:50
davetherave1970 said:
What happens when the fans kick in? I still have my stepper connected and I think it adjusts the idle when the fans switch on and load the system?
I have had a steady idle ever since i disconnected the stepper. very very slight drop when the fans kick in but not enough to notice or worry about.
tvr keith said:
Interestingly Chris Baldock also told me that it is best to clean the throttle pot with carb cleaner at the same time;
The throttle pot is an electrical sensor on the side of the throttle housing. There's no sensible way to clean it. I'm pretty sure you're talking about the throttle plate i.e. the round disc inside the throttle housing.
tvr keith said:
Strange that the re setting procedure is not mentioned in the Bible
Not really as this is the first time I have heard of it. it doesn't appear in any of the TVR/Rover docs.
No one at TVR or the several dealers that reviewed the drafts picked up on it either.
The other thing is that I and many others have been cleaning the stepper motor for years on a variety of cars without any problems. Remove, clean, refit, job done. Never had a need to do anything else.
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