Missing on acceleration

[Woodsta888]

Hi,

My other halfs Z3 2.0 misses at around 1700 rpm (flat spot?). Bit kangarooey in the low revs in 1st & 2nd. Filling with fuel when hot and the thing barely runs at all on restarting. TOtal loss of power. Wont start again until cold. The Indie changed the MAFF at great expense and I'm dubious about going through change every sensor until it works.

You guys got any ideas of what I can look for / sensors it could be?

Thanks in advance for any replies.

 

[Grumps]

Lee is your man. I'm sure he'll be along later.

 

[billz]

Could be a split in the air hoses, if it was a sensor i would of thought you would have the warning light on as these are managed by the management system

 

[GazHyde]

Could be a split in the air hoses

Agree, or you could try disconnecting the MAF and see if there is any difference.

sensor i would of thought you would have the warning light

Not all sensors make the EML come on annoyingly. I have a faulty cam sensor and it doesn't bring the light on (which is probably why I haven't changed it!)

 

[Dino D]

I had similar, ruled out the MAF by reading here to try disconnecting first to see if any change.
Read the codes and said it was a faulty sensor (I think it was crank sensor, the one at the front behind that big fan).
No EML lights.
Just get the codes read and it will tell you exactly which one so you don't have to swap them randomly.

Ps your indie must have done this prior to changing anything?? Unless it is a real small indie with no code reader, in which case but/borrow a code reader or get to a garage that does have a reader.

I'm in Kent (Canterbury) if you wish to use mine.

 

[t-tony]

Very similar to when the inlet cam sensor went faulty on my car. 2000, 2.0 Auto. Didn't put fault code light (EM) on.

Tony.

 

[Woodsta888]

Thanks for all the replies.

All hoses were checked last time (indie) and the time before by a different garage (not indie).

Filled with fuel this morning when engine cold (200m from pertrol station) Within 2 mins running rough - further I drove more cylinders shut down - car shaking at idle. Limped to indie and they put on code reader and said mifire on all cylinders and no othr error codes. Cleared codes and it ran fine. Said they need it in to look at it. I have no fault lights on the dash. The flatspot once reset disappears around 1700rpm. Must be one of the sensors breaking down. Bit annoyed I already paid for a MAFF replacement

Thanks for the offer of code reading but I'm in Exmouth, Devon.

 

[TaffZee]

Dont like to write this, but could be a problem with the Vanos. All the symptoms of worn seals

 

[Woodsta888]

Whilst you didnt like to write it I hadn't considered or when searching come across that as the possible cause. Smething else to investigate before chucking money at sensors. Thanks.

Indie is so busy cant book it in until the14th may so time to inform myself and investigate.

Would the vanos be intermittent like that and why would worn seals be linked to a stop start or arefuel. Immediately after every refuel it plays up. Other stop starts it's fine. WOnder if abrether somewhere is blocked as pressure is released after I open the filler cap? = ECU sees change it cant handle from last drive looking for same pressure build up?

 

[t-tony]

When you remove the filler cap do you hear air rush in/out of the tank? Have you tried running the car with fuel cap not tightened fully or even try one of those temporary type caps, the one without a screw in the centre (not sure if you can still get these as they fail the M.O.T.)

Tony.

 

[bertiejaffa]

everything does point to split air pipes imho - have you checked them? won't take long, just follow back from the air filter to the engine, carefully pulling back each rib....

 

[Woodsta888]

Again thanks for the replies.

I have checked the hoses and 2 garages have inluding a very in depth one at the indie. I'd have thought that if the hoses were split then the issue would be there all the time. Thoughth flatspot or hesitation at 16-1700 rpm is there all the time

This manifests itself immediately aftr filling with fuel. USed to be intermittent. But now happens every time. Air does rush in on removing the filler cap. I wonder if after driving it for a couple of days I let the air out again and see if it starts to misfire again. Free and easy test.

I have a laptop with INPA on it but apart from scrolling through I don't know what I'm looking for. I selcted older models E36 - M52 new as the model. There are sme VANOS tests in there - will these highlight damaged seals?

 

[smartbear]

I don't think you have a vanos seal issue as that would just give the engine a flat-spot & not shut individual cylinders down as you said, get a smoke test carried out to test for air leaks, if that's fine then it's looking like a duff sensor.
Regards

 

[oldcarman]

Was there not a couple of members that went through this same agony several months ago maybe @Barry Gadd and @joey. Or was it someone else? I searched but wasn't able to find anything on my iPhone? JIM

 

[t-tony]

Was there not a couple of members that went through this same agony several months ago maybe @Barry Gadd and @joey. Or was it someone else? I searched but wasn't able to find anything on my iPhone? JIM

I think they were both M44 massive members Jim, different motors.

Tony.

 

[Barry Gadd]

Hi Jim, and all members,
Joe and myself didn't have the above problem. We had air lock difficulties and warped cylinder heads on our M44's. Both cars running well now (hope I'm not tempting providence here.....) We're now working on a Fiat Coupe 2.0L 20valve project.We must be mad....

 

[oldcarman]

I think they were both M44 massive members Jim, different motors.

Tony.

For the second time in a couple of days I've been wrong, go figure!! Thanks T-, JIM

 

[Woodsta888]

OK so I have managed to get a version of EDIABAS workng on a laptop with a lead from China and these are the errors I can see currently (bold).

I guessed I needed to select Older Models from the menu. E36 anthen I used MS42 for M52TU new! for the car? Is this correct?


Anyone know what sensors I need to be looking at to test/replace?

Thanks in advance

Version:0.9 StartHtml: 105 EndHtml: 5828 StartFragment: 334 EndFragment: 5796
E R R O R M E M O R Y R E P O R T -------------------------------------
Date: 04/26/15 10:36:22 ECU: MS420DS0 JobStatus: OKAY Variant: MS420DS0-------------------------------------------------------------
RESULT: 2 errors in error memory !-------------------------------------------------------------

123 avtivate grid-controlled cooling
Error frequency : 1 Logistic counter: 40
Engine speed 704.00 1/min load 54.47 mg/Hub temperature cooling water 74.25 Grad C Battery Voltage 13.87 V appear before (rel.) 2.40 h
Kurzschluss gegen Masse oder Leitungsunterbrechung CARB-Fehler Fehler nach Entprellung gespeichert Fehler momentan vorhanden statischer Fehler
Errorcode: 7B 72 01 28 16 0A A3 88 85 96-------------------------------------------------------------


140 Signal tank-leck-diagnostic-pump reed-switch not clossed
Error frequency : 1 Logistic counter: 40
load 54.47 mg/Hub Engine speed 704.00 1/min temperature cooling water at the start 53.25 Grad C temperature intake air 39.75 Grad C appear before (rel.) 2.20 h
CARB-Fehler Fehler nach Entprellung gespeichert Fehler momentan vorhanden statischer Fehler
Errorcode: 8C 71 01 28 0A 16 87 75 85 98

 

[Brian4]

Not sure about the codes but you have it plugged into the round 20 pin diagnostic under the bonnet as the obd socket is limited in function.

 

[Woodsta888]

Yes plugged it into the round 20 pin socket under the bonnet.

123 in INPA codes is Map Cooling Thermostat Control
140 is Tank Leak Pump Solenoid – Reed Switch Open or Output Stage (MS43)

Though MS43 is a different coding subset. May have to start a new thread with INPA EDIABAS coding help. I'll search 1st.