Strange intermittent short stutter '95 850 t5 Topic is solved

kaneelschep · Post by **kaneelschep** » 25 Jun 2016, 09:04

I replaced the coolant sensor by an original new one shortly after I got the car. Since it gave the revving by itself symptom.
Shouldnt really be anything wrong with it.
What data should I actually measure on it?

Post by **erikv11** » 25 Jun 2016, 16:41

Interesting you mention the TPS. I once ruined the TPS on my 850 by letting solvent get inside when I was cleaning the throttle body. The symptom was intermittent stutter, although maybe a little different from yours because it seemed to happen only at certain speeds, as if there was one bad spot in the TPS plate. Anyway, the easiest way to test a TPS is to swap in another one, not too useful I know but something to consider.

kaneelschep · Post by **kaneelschep** » 29 Jun 2016, 10:29

So today it seems was the last day for the failing part.
The stutter came and never went away while driving for an hour and 70km. Sometimes it was less, but mostly it was more

Even when keeping my foot very still at lets say 2000rpm, It would very quickly drop and again pick up the rpm. Very fast after each other. It feels very very violent and nasty.
Revving in neutral feels like normal, but when you let the clutch back up or take of in gear, so under load, it buckles violently again.
Only when keeping the foot very still at low rpm it will go. But under protest. especially in the lower gears. No power and smoke and heavier buckling if too much gas is pressed.

I had this symptom a few times in my life.
First time it was the tps on my old opel kadett gsi.
Second time it was a torn and flattened benzine hose at the benzine pump of said car.

I went looking for tps's and found 3.
30 euro, 58 euro and 130 euro. First is the brand eps. second a bosch, third a pierburg.
All I know of pierburg is that they made very very crappy carburators for volkswagen and opel.
anyone know eps? Bosch is always nice of course.

Anyone has maybe something more to say about it??
Thanks!

Post by **erikv11** » 29 Jun 2016, 11:33

The TPS from the factory was Bosch, that's the brand I have gone with when I bought new ones. Not much more input I can provide, alas.

kaneelschep · Post by **kaneelschep** » 30 Jun 2016, 03:40

I googled the bosch tps. And it seems to have been fitted on a huge list of cars. Even on that old opel kadett gsi I used to have.
So I am going to the junkyard now and see if I can find one.
Just to test. If it solves my problem I buy a new one.

Post by **erikv11** » 30 Jun 2016, 08:04

Well keep in mind that the TPS is a rare-to-fail part. I have only had one go bad on me, and I have seen a lot of these P80 cars. A second one I replaced was because I ruined it by getting solvent inside when I was cleaning the throttle body. Since they fail so rarely, I would use a TPS from a junkyard as a permanent solution. I've got a couple junkyard spares now and don;t expect I will ever have to shell out for a new one.

kaneelschep · Post by **kaneelschep** » 30 Jun 2016, 08:45

Out of the 15 cars I owned and all the kms I made, only one failed on me too. But with the same symptoms.
Trying one from the junkyard for a few euros can never hurt and is easier than spending 60 euro on nothing like with the fuel pressure regulator wich ended up not being broken.

It seems a lot of the cars on the list allready died and became rust. Mostly newer stuff at the wreckers here. Cars don't die well in this rainy country.
Anyway in the morning I found a saab 900 precariously balancing on top of a saab 93 with a promising tps.
But after lots of sweat, acrobacy and annoyment on that one little bolt wich is always stuck, round, rusted or otherwise not in the mood, it ended up being a slightely different tps. With the hole in the centre instead of offset.

But just now after work I found an alfa 145 wich had the right one. And it came off like a dream. It looks a lot fresher than my one btw..
Unfortunately those ten minutes in the rain got me completely drenched. So I am staying in till it stops or the day is over. wichever comes first.
Working outside on cars in Holland is mostly not fun..

Post by **erikv11** » 30 Jun 2016, 13:20

Great!

I hear ya. All I was saying was that if the junkyard TPS works just go with it, I wouldn't bother buying a new one.

kaneelschep · Post by **kaneelschep** » 01 Jul 2016, 06:22

Ah like that. Yes, good idea. I will leave it.
It did'nt help anyway

Too bad. but we soldier on.

The engine still ran bad. Hard time idling, correcting, but rpm going lower and lower. Gas response very harsch/bad and sluggish. Only by pumping the throttle a bit I could get it to go higher in rpm.

So today I just wanted to focus on cleaning and inspecting the sensors and cable connections etc.
I bought some motip electronics/maf/sensor cleaner spray.
And started by checking all around the maf.

Turned engine off and took the maf plug off and started again. This time it immediately had a better idle.
It still ran rough and sluggish on the throttle, but better and different.
Big change!
Cause this was the frst time it actually reacted on taking the maf off. I tried the same a few times before and it didnt really make such a noticable change..
So I took the maf apart and out of its housing. Cleaned the housing well with lots of spray and cloth. And cleaned the thin maf film and surroundings just with the spray, let it all dry and put it back in.
It had about a mm of thick black sticky dust stuck to the side of the film and some stripes on it.
Cant be good.

And then the car just ran like normal again.......

I drove it all around town at different speeds and no problem, hickup or stutter whatsoever.
Feels quicker and more powerfull on the throttle then ever.

Now I am not saying this is a proper fix until I drive some hundreds of kms without problems!!!

And it is a bit strange to me.
I thought the telltale signs of a broken maf would be more to idling and throttle corrections going up and down.
For instance when you just suddenly let go of the gaspedal it will fall below 950 and correct it up again constantly.
Never heard of a maf go so slow and intermittent. thought they were either dead or good.
It did this for quite a long time now. And only now after a long time of mostly working it suddenly became a big issue.

nah. I am happy It seems I can drive normally again. But lets see what happens in the long run.

kaneelschep · Post by **kaneelschep** » 05 Jul 2016, 07:50

Did 500km without a hickup.
I was wondering if i should reset the ecu after cleaning the maf. There must be a difference how it functions now without the gunk on it.
And should i think of replacing it?

Strange intermittent short stutter '95 850 t5 Topic is solved

Re: Strange intermittent short stutter '95 850 t5