1998 1.4 erratic idle

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johnnybaby
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Drives: 1998 6N1 1.4
Location: Stockport, Cheshire

1998 1.4 erratic idle

Post by johnnybaby » Sat Oct 15, 2016 9:42 am

Hi. My 1998 1.4 has done 12000. It has a very erratic idle, sometimes almost stalling. The revs can go from normal idle down to 2 or3 hundred and then will pick up again. It has stalled a couple of time, that's in neutral, the clutch is ok. It drives ok and the fuel economy doesn't seem to have suffered. I've swapped the throttle body and inlet manifold. It's has a new cat and lambda sensor for the last MOT and I've fitted a new MAP sensor. I've checked the air hoses and they seem ok. Any ideas please before I go crazy? Thanks, John

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alexperkins
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Re: 1998 1.4 erratic idle

Post by alexperkins » Sat Oct 15, 2016 6:25 pm

have you had it scanned for faults?

Could be a faulty earth amongst a variety of other things including coil, leads, sparks, fuel pump etc

johnnybaby
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Drives: 1998 6N1 1.4
Location: Stockport, Cheshire

Re: 1998 1.4 erratic idle

Post by johnnybaby » Sat Oct 15, 2016 8:25 pm

Yes it was scanned and no faults showed up. It hasn't had its plug leads changed but since the problem is only really at idle I'm at a loss...The air filter is new, the engine breather at the back has been cleaned out and it has a new hose. It has a new cat and lambda sensor and MAP sensor.

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alexperkins
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Re: 1998 1.4 erratic idle

Post by alexperkins » Sat Oct 15, 2016 8:26 pm

Have you checked the pipe that goes to the brake servo as these have a habit of cracking

johnnybaby
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Drives: 1998 6N1 1.4
Location: Stockport, Cheshire

Re: 1998 1.4 erratic idle

Post by johnnybaby » Sun Oct 16, 2016 9:21 am

It looks ok but I'll double check it. Thanks.

johnnybaby
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Posts: 4
Joined: Sat Oct 15, 2016 9:28 am
Drives: 1998 6N1 1.4
Location: Stockport, Cheshire

Re: 1998 1.4 erratic idle

Post by johnnybaby » Thu Oct 27, 2016 8:57 pm

Sorted! A garage I know used a smoke test to find the leak. Exhaust manifold gasket leaking, close to the lambda sensor! It needs a new exhaust system too. New gasket and it runs as it should.

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alexperkins
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Re: 1998 1.4 erratic idle

Post by alexperkins » Thu Oct 27, 2016 8:59 pm

Excellent

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