Engine STILL occasionally reving up on its own 'FIXED'

[Martinaston]

liquid079 Are you sure the kangerooing is not down to a worn drive train ?
After i'd sorted the problems with mine after servicing it and cleaning all the other bit's it idled perfectly.
Exactly where it should be but lower than befoe and all it did was highlight how much play was in the gearbox and half shafts which was causing all the bouncing.
How many miles on your clock ?

[abelai]

Just tested the voltages going to the TPS connector and the outer pins both have 12v with the ignition on you said earlier that you had 10volts but that could just be your battery being a bit drained from all the other tests you've been doing my ICV has 9volts to one side and 4volts to the other and 12volts centre.

If you want any other voltage or resistance tests to compare let me know
Test for the CPS resistance should be 540Ohms +-10%

My car is currently running exactly like 320iAN's hunting when warm low idle trying to stall eco bouncing when it almost dies and the temp gauge blip, but thats my ICV just too poor to replace at the moment

[e30bmlover]

just do what i would do and replace everything!!!

[liquid079]

320iAN- do you think a coil problem would show itself like this? I have tested it but seeing as its intermitent I guess anything is possible.

Abelai-Thanks for that, I'll see if I can get my head round that. I have the bmw cd but I don't really find it a lot of use really. Thats an idea I'll try that later. I done the test on the tps connector that you mentioned and had continuity on the outer pins. I'll do some more tests later and see what I come up with.

You can have my old L-shaped icv if you want, for the price of postage,I'm not sure how well it works though.
If you're buying a new one make sure you use gsf car parts, as BMW sell the same one but at around £40 more expensive .

Martinaston-The kangerooing is definately fuel/electrical problem as it only happens occasionally, plus new:

Engine mounts
Gearbox mounts
centre bearing and carrier
axle mounts
rubber Guibo
diff mounting bush
Rear top mounts
propshaft to diff rubber bush(whatever thats called)
Good gearbox and diff with fully synthetic oil in both.

I have 157k on the clock.

e30bmlover-I almost have.

[abelai]

I done the test on the tps connector that you mentioned and had continuity on the outer pins.

Are you saying the idle pin and the centre ground pin if so thats fine or are you saying the idle pin and the WOT pin cos that would be wrong. I might be missunderstanding you though

[abelai]

Thanks for the offer but I need the T-shape ICV.

[320iAN]

320iAN- do you think a coil problem would show itself like this? I have tested it but seeing as its intermitent I guess anything is possible

i'm just thinking along the lines of how some older cars "REV- counter" is wired through the coil and that most of the time a coil may help start a car's engine but may fail (break up) under load?

just another part to check

[abelai]

Well I've ordered a new ICV for mine from GSF £77 ouch and that was after I asked for discount they wanted £93 at first!!

[liquid079]

I done the test on the tps connector that you mentioned and had continuity on the outer pins.

Are you saying the idle pin and the centre ground pin if so thats fine or are you saying the idle pin and the WOT pin cos that would be wrong. I might be missunderstanding you though

I bridged pins 52 & 53 on the ECU connector and had continuity between the two outer pins on the TPS connector, I've now ordered a new TPS from BMW .

I also have a T-shaped ICV, but its a bit old and rusty, and a bit late now.

32OiAN- I have tested the ignition coil voltage and it seems ok.

I have my fuel pump out and will be putting me spare one in later to find out if anything changes.

[siddiqi1]

superb effort and wilingnes to corect the isue.

Admire your determination,cant wait for the solution,as im sure you are!

Keep at it buddy

Saboor

[abelai]

I bridged pins 52 & 53 on the ECU connector and had continuity between the two outer pins on the TPS connector,

Sorry i forgot about testing the wires for breaks, yes that means the wires are fine loom is good. How much is the TPS £40ish?

[abelai]

I just replaced my ICV and have had no change still doing the same thing. I only started it for a second heard the revs start to dip to 500 then rise and turned it off and walked away to stop myself from kicking the crap out of it and burning it .

[liquid079]

Cheers Saboor, yea can't wait to find out what it is... I'll probably celebrate with a bottle of shampagne.

I've changed fuel pump and fuel preasure regulator, symptons still here so it is not these that are at fault.

abelai the tps is £54+ vat from BMW as GSF didn't have one in stock.

Unluck with the ICV, just think of the satisfaction you'll get when you've sorted it.

Dan

[abelai]

I know but I'm running out of things to replace lol.

[abelai]

Have you got the TPS yet and if so has it changed anything?

[liquid079]

No, not yet.

Should be coming through tommorow, I'll keep you updated.

Dan.

[abelai]

Did BMW come through with the goodies? Have you made any progress?

[liquid079]

Yea got it through, the part no. is different from the old one though .

Hang on, now I've got a flat battery...

[siddiqi1]

uppppppppppppdaaaaaaaattteeeeeeeeeeeee plllllllsssssssssssssssssssssss

[liquid079]

Was going to jump start the car, but then I realised it was pissing down and getting dark, suddenly I lost my enthusiasm.

Tommorow morn it'll have to be.

Hell. Just realised this thread is into three pages now... How long can it last!

[320iAN]

my new replacement ECU has just arrived .. but i'll not get time to fit it till tomorrow .. fingers crossed my car while idle smooth again!!
or is this just the start of replacing everything

[320iAN]

or is this just the start of replacing everything

managed to get 10 mins .. so ive fitted the ecu no joy, still reving it's self and stalling and the fuel eco needle is still jumping about.
i did unplug the TPS and it made no difference to the engine idle, even when i reconnected it .. nothing not a difference (i did this with the engine running and i rev'd it)

[liquid079]

Ok I jumped the car this morning. Strangely it started immediatly without me leaving the battery to charge .

With my new TPS, my new preasure regulator, my new ICV, my new fuel pump, my new ECU, my new air hoses/bellows, my new temp sensors, my new dizzy cap, my new rotar arm, my new throttle body gasket, my new cam cover gasket, my new Miller MAF, my spotless earth points and my knackered old battery, she idled fairly nicely for five minutes, maybe a bit high and then...

.

STILL doing it.

So I'm going to get a crank position sensor from a scrappy, maybe tommorow, and after that It'll just be the coil I haven't replaced. It's looking increasingly likely I'm going to have to visit the local BMW specialist unless anybody has any better idea's .

320iAN- Have you got a multimeter? cos its probably worth doing some simple checks to eliminate earth/wiring problems.

Dan.

[fowler]

have you tried th pic up sensor on your HT leads. ??

[liquid079]

The pick up sensor?

Is that the pulse sensor, that ends up next to the crank position sensor socket.. the one that has been chopped in half??

Dan

[siddiqi1]

Ok I jumped the car this morning. Strangely it started immediatly without me leaving the battery to charge .

With my new TPS, my new preasure regulator, my new ICV, my new fuel pump, my new ECU, my new air hoses/bellows, my new temp sensors, my new dizzy cap, my new rotar arm, my new throttle body gasket, my new cam cover gasket, my new Miller MAF, my spotless earth points and my knackered old battery, she idled fairly nicely for five minutes, maybe a bit high and then...

.

I really feel for you here, seriosuly i really do, but you are going to kill me for saying this.....but you know how funny it sounds....just take a second to read it again with some humour......made me laugh

But come on.....i have the upmost admiration for you, by now, honest i would have smashed every panel in


Saboor

[siddiqi1]

Liquid,

Where are the earth points...specifically for the engine buddy?

I know the one on the suspension turett, but where is the "engine earth strap" located???

Saboor

[abelai]

Engine earth strap is located under ther airbox from the chassis leg to the sump.

[liquid079]

Ok I jumped the car this morning. Strangely it started immediatly without me leaving the battery to charge .

With my new TPS, my new preasure regulator, my new ICV, my new fuel pump, my new ECU, my new air hoses/bellows, my new temp sensors, my new dizzy cap, my new rotar arm, my new throttle body gasket, my new cam cover gasket, my new Miller MAF, my spotless earth points and my knackered old battery, she idled fairly nicely for five minutes, maybe a bit high and then...

.

I really feel for you here, seriosuly i really do, but you are going to kill me for saying this.....but you know how funny it sounds....just take a second to read it again with some humour......made me laugh

But come on.....i have the upmost admiration for you, by now, honest i would have smashed every panel in


Saboor

Lol.

Actually I'm pretty cool about it. When I pulled my old engine out, and rebuilt the new one I had almost no experience of working on cars so the learning curve was pretty steep and I made a few expensive mistakes, and there were times when I was close to ringing the scrapyard and getting it taken away. But now I try to think of things that go wrong as a challenge not a problem . But this one takes the p%ss a little.

Luckly I don't rely on my car as I cycle to work plus have the use of two other cars in the household, a whole host of work vehicles, a unicycle and a tractor(if I'm really desperate).


Ground points as abelai said plus worth checking:

On the front fender behind the left headlight.
Under the rear seat on the left/back.
Just above the brake pedal, beneath instrument cluster.
Behind the glove box somewhere(find the brown wires).

These are the obvious ones, though if you buy a multimeter you can test them all from the ECU harness.

Also might be worth connecting a jump lead between the inlet manifold bracket and the main ground point by the battery, this sometimes shows interesting results if you have bad earth.

Oh and good luck.... you may need it .

[siddiqi1]

thanks for that vital info buddy.

Ah no wonder you are so patient, it causes all sorts of problems when the vehicle in question is the daily runner!!!

Be it a steep learning curve, i believe anyway, that a hands on approach is the only way to learn, books are good but i think you'll agree, until you get your hands dirty, its all just words.......

I will def. buy you a drink when you have solved your issue, because you damn well deseve it.

Ground points as abelai said plus worth checking:

On the front fender behind the left headlight.
Under the rear seat on the left/back.
Just above the brake pedal, beneath instrument cluster.
Behind the glove box somewhere(find the brown wires).

These are the obvious ones, though if you buy a multimeter you can test them all from the ECU harness.

Also might be worth connecting a jump lead between the inlet manifold bracket and the main ground point by the battery, this sometimes shows interesting results if you have bad earth.

Oh and good luck.... you may need it .

I have a 325i Sport, and have the battery at the back, so how do i do what you have suggested i.e.e connect a jump lead to the battery earth and inlet manifold?

Are you aware of an Earth in the engine bay, ie.e the sump area....have you seen it before?

Regards

Saboor

[abelai]

Main earth point in the engine bay is by the o/s strut, earth point by your abs pump behind the n/s headlight is mostly for the body loom, main engine earth is as said before.

[siddiqi1]

thanks buddy,

Will have a look and check these up

Thanks

Saboor

[320iAN]

found this
Start the car. Run the system "open loop" by pulling the electrical connector from the ICV. The RPM's should climb to about 1500-2000, and then oscillate back and forth between about 600-1500rpm. If reconnecting the electrical connector has no effect on RPM's, your ICM is probably at fault. (For the curious, your RPM's fluctuate because when the ICV is disconnected, the valve is stuck wide open, and the DME is the only thing controlling your idle. The RPM's rise until it cuts the fuel flow, which causes RPM's to dip. Then it restores fuel flow, and the cycle begins again.)

thers loads more on this here: http://www.verrill.com/car/e30_idlefaq.shtml

what is the ICM ?

[320iAN]

also what and where is this: E30 Idle Increase Relay

[abelai]

Hi 320iAN

ICM is an idle control module found on motronic 1.0 m20 engines and disscussed on forums in the USA all the time no help to us unfortunately as idle control is done by the DME in motronic 1.3. You will usually read about them adjusting the screw on the ICV which we don't have, this is one of the other problems with trying to get good information about fault finding on the M20 there are different versions and alot the fault finding guides I've looked at refer to the pre 87 setup or in the USA they rattle on about o2 sensors that most in the UK don't have.

It's all very frustrating. Hope you got my PM and weren't too shocked by the amount of things I've already tried. Do you know exactly when your fault started and or how?