Technical Marea, she no idle!

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Technical Marea, she no idle!

Plbmak

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Oct 29, 2010
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Kings Lynn
Good morning everyone, I hope someone may be able to help. I have a '99 Marea 1.6 that for a few weeks has struggled to idle. Cold start was good, ticks over nicely. As soon as it warms up it stalls at every junction. I was thinking idle control valve, but lived with it for a bit. Yesterday, while driving, it started to judder real bad on zero throttle and at low revs coughs and farts until about 2500 revs. It then pics up cleanly. It no will not tick over at all. I can run it by winding up the throttle cable adjustment, a lot, but it barks bangs and judders. I've tried disconnecting sensors, and the one that gives a better result disconnected is the MAP sensor, I can turn down the idle quite a lot and it will still run, but REALLY rough.

I have checked for any air leaks on the induction side, in my experience this has a similar effect, but all is good. The leads are new and so are the plugs, but the plugs were very sooty when I checked them.
I’m thinking a sensor, but I’d appreciate any advice. I did wonder if a bad Lambda could cause this....
PB
 
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i would be thinking your map has gone faulty,do you have another one to try?
certainly on later puntos these can fail and not show a fault code
can you get a local garage to do a co type emmisions test to confirm your car is being overfuelled?

for some reason i thought you were abroad
anyway get local mot station to stick their pipe up its zoomy
 
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Hi, thanks for the reply, I have a new MAP sensor on the way as well as a Lambda, I had heard they could go a bit temperamental. Also, A friend is going to lend me his diagnostic kit and exhaust analyzer, so that's a start as well. I couldn't think of anything else that would go so bad so quick. I really don't want to drive the car as bad as it is, the annoying thing is I only just had it on a dyno to set the cam timing.:shrug: (Home made adjustable pulley's)
Regards,
PB.
 
Update

OK, I have replaced the MAP sensor and the Lambda sensor, no difference. I Have a new Crank sensor on the way.
 
This was my first thought! The first thing I checked as the symptoms were exactly that, but got a lot worse. I'm just waiting for a crank sensor to fit, I must admit I have convinced myself that is what is wrong, so if it isn't....
 
Hmm. Well, if you choose to drive a Tilley lamp, that’s your choice. My choice is to NOT drive an oil burner! :cool:
I have to say, I don't think there’s a lot wrong with mine, but it's just a grind to narrow it down to what’s exactly wrong. I had hoped that in a forum such as this, someone may have had a similar problem, or at least a solid idea of the first thing to look at.
What’s annoying for me is that the day before it went wrong I had the cams set up on a rolling road. It now has a lovely power curve with minimal flat spots and develops good torque, at least for a 1.6 engine. And I haven’t been able to drive it! :mad:
If you really want more info, the car has its own blog; I can provide a link to it....
;)
 
Hi. (y)
I have checked all connections, had them all apart and inspected. I would only be able to blame myself as I do all the work on this car, even when on the rollers. It is a fault that has been slowly getting worse but was nothing like an issue, until the day after the cam setup. On the way to the pub from the rolling road:)D) it felt soo drivable!
It was also one of the wettest days we have had here in a long long time. (If you don't live in the UK, you will have to check the news to see what we have been undergoing....)
 
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OK, thanks, I'll have a go, I'm starting to think it's blown a head gasket, it wasn't the coil pack..
PB
 
Wow! 143bhp? That's pretty good, I'd love to know the spec. All I've done to mine is had the cams reground to a fast road spec, and I put on a home made header and exhaust system. Oh, and junked the standard induction. I had mine up to 111bhp on one run, starting from 90bhp, however we backed it down to 109bhp as the power curve was so smooth, and the torque curve was pretty flat.

In answer to Peters question, there is no clear indication of a blown head gasket, except a sound like a blown exhaust, but no evidence of a blown exhaust. I'm now thinking that my initial thought of an air leak on the induction side may have had merit, although I have had the entire induction off and there were none.

I should get a compression tester on sometime today.
 
OK, compression checked, and is good on all 4 cylinders. Very good. Had the idle control valve off, cleaned that up with WD40, plugged the lead in and tried it, seems to be moving in and out, but I'm not sure how much movement there should be.
PB
 
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