HELP! - MCSF and nothing over 3000rpm - Alfa Romeo Forum
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(Post Link) post #1 of 12 Old 04-12-09 Thread Starter
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Help HELP! - MCSF and nothing over 3000rpm

Just been for a Warrant of Fitness this morning, she passed, which put me in a good mood. But not for long.

When I left the testing station the engine turned over a few times before starting and gave me the MCSF warning straight away. I pulled out of the intersection at the testing station and the engine would not rev beyond 3,000rpm. I suspect this is the dreaded "limp mode" that I've heard about. Made it home but had to change up before 3,000rpm each time.

I have had MCSF warnings recently, but with no symptoms that anything was wrong. No loss of power, no flat spots, no mis-fires. I assumed that the issue must be electronic. From reading other posts on here I'm thinking it could be the battery. Must borrow a multi-meter and check.

Any other ideas? What else should I check?

She's a 2002 147 2.0TS, and had a full 100,000km (60,000 mile) service at my local Alfa specialist about 7,000kms ago.
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Yep that's "limp mode" ... you need to "invest" in Alfadiag and read out the error codes then you'll know where to start looking ...
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(Post Link) post #3 of 12 Old 09-12-09 Thread Starter
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I had looked at AlfaDiag, but I'm a Mac user so that won't be an option unless I get a PC.

I've checked the battery and that seems to be fine. It shows 12.6v with engine off, it drops as soon as I start the engine but soon picks up to around 12v. It also doesn't drop if I turn the lights and stereo on at idle.

There's been no more limp mode issues, but I get the MCSF warning light after about 10 minutes of driving.
There's no change in performance when the light comes on. The MCSF comes on regardless of driving conditions. It can be stop/start, stuck in the rush hour traffic jam, or cruising along the motorway at 100km/h.

Fuel economy is OK, considering the heavy traffic, hard working air con, and that I'm running on BP ultimate this week. (for some reason BP ultimate has a detrimental effect on my fuel economy). So I'm ruling out MAF or Lambda for now.

The run to and from work is generally fine, 32kms each way. However the engine often turns over several times when starting. It always used to start without hesitation.

I will see my local specialist on Sunday, he'll be at the Auckland Owners Club BBQ. I'll pick his brains a bit. I'm also going to fill up at Caltex on Friday and see if that makes any difference.

I'm wondering if it's an ignition fault, but I don't get any misfires or rough running.
Still a bit baffled as to where to start. The whole thing is a million times more complicated than my old '76 Mini 1000.
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have you had or are you due a CAM belt Change?
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with the engine running it should be about 14-15v ...
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Quote:
Originally Posted by 156Chris View Post
with the engine running it should be about 14-15v ...
Ditto 14.4volts at idle...

where i was going regarding the CAM belt is if the Belt has been changed who ever done it might of mashed the cam position sensor, but if it hasnt been done the tension on the belt could be slack and causing the ECU to see an error from the timing...

MAF and Lambda's dont normally enduce the limp mode...

Last edited by biffa; 10-12-09 at 05:17.
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I'd suspect the cam sensor. I had a similar issue with a GTV - the semiconductor within it was fine when it was relatively cold (say below 50degC or there abouts), but once it warmed up (it's bolted to the cylinder head, so it doesn't take long) it failed.

Being an older car, it didn't have a limp mode as such, but the light came on.

It can be tested with an oscilloscope, but as mentioned above reading the fault code would be the best way forward.
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(Post Link) post #8 of 12 Old 10-12-09 Thread Starter
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OK, so the battery may be at the end of it's life. Cambelt is due at 120,000kms. I'm saving up for it as Cambelt changes cost a small fortune in NZ. Will get Tony at Performance Automotive to take a look at the cam sensor and timing.

Cheers for all the help guys.
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This is defo a cam sensor fault,if engine runs spot on but just wont rev over 3000 revs.This problem happens on a lot of other cars mostly vauxhalls.
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alfa wont rev over 3000rpm cam sensor fault

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Originally Posted by tony sweeny View Post
This is defo a cam sensor fault,if engine runs spot on but just wont rev over 3000 revs.This problem happens on a lot of other cars mostly vauxhalls.
im getting this problem with my alfa 166 2.0 litre twinspark ive just dont a bottem end on it and car drives but wont rev ove 3000revs, and engine management light is on ive plkugged in a obd2 and it comes up with error code for cam sensor fault so im thinking cams sensor has a problem,timing not right,its on limp mode,needs resetting so car will allow to rev more than 3000rpm as its also loud sounds like a diesel can any1 help my email add is [email protected] thanks
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Does it sound like a deisel because the timing is out and its causing one camshaft to be out of position and the valves are hitting the pistons.I had a siomilar problem with a head gasket replacement.As there are a variety of thicknesses it pays to get the right one or the valves can touch the pistons when running.
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hello i didnt touch the head of mine just the bottem end completely changed and i doubt its the timing out as im quite sure its been timed correctly as 1- used cam locking tools on the camshafts 2- all the marker lines matched up on the belt and tensioner works as it should, im thinking more along the lines of cam sensor first and that should sort out the revving of only 3000rpm and then maybe variater but what hits me is that before the bottem end was gone it most likely was working why all of a sudden when ive just chnaged bottem end on it its decided to that cam sensor isnt working and the variater 2? also have you got the correct and accurate guides to doing the cambelt does any 1 wana buy this car of me how it is for £1600 as ive not got the funds yet to do the cam sensor or variater 07775677792
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