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Old 29-01-2009   #31
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Re: Rough running

You guys are very helpful and I really appreciate it. Thank you, I will buy a multimeter and injector cleaner tomorrow and check the operation of the temp sender.

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Old 29-01-2009   #32
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Re: Rough running

The last MOT (1 week ago) shows that the Lambda sensor was 1.02 The max is 1.03 and the min 0.97.
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Old 30-01-2009   #33
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Re: Rough running

If you are going shopping, the data I have shows 320 ohms at 80 deg for the coolant sensor, if my memory works, the plug is the female part of the connection so if you can buy one or a series of resistors at 320ohms and push it into the contacts, then let the car warm up, when it starts missfiring, pull the plug off and plug the resistors in, if the missfire stops, hey presto!!

But we seem to have forgotten that you said if you disconnected a different connector, all seemed to go away...............
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Old 30-01-2009   #34
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Re: Rough running

.....and I thought LRB had one of the newer Barchettas so could explain exactly where the mass air sensor is situated! Tut, tut.

In terms of condensation: I found it got better when the engine warmed up, so it's probably not that.

The temperature sensor or injector ideas sound good though.
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Old 30-01-2009   #35
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Re: Rough running

Just checked the injector and coil resistance starting from the cambelt;

1. Injector 17.1 ohms, Coil ~ 68 ohms
2. Injector 17.1 ohms, Coil ~ 68 ohms
3. Injector 16.9 ohms, Coil ~ 68 ohms
4. Injector 16.9 ohms, Coil ~ 68 ohms

Variator solenoid was ~16 ohms

Temperature sensor was a maximum of 320 ohms

I had just driven to and from Halfords to get the multimeter so the engine was hot.
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Last edited by afroking; 30-01-2009 at 18:02.
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Old 30-01-2009   #36
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Re: Rough running

not sure about the coils, maybe the data I have is wrong??? Anyway, the injectors are higher than my data but that might just be because they were hot at the time of measuring. The water temop is smack on though so I would be pushing loads of injector cleaner through over the next few tanks!!
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Old 30-01-2009   #37
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Re: Rough running

I have just filled up and put a bottle of Redex injector cleaner in the tank. It seems to misfire more frequently when idling now. Also I have noticed when accelerating lightly it misfires. I spoke to my friend who suggested the HT leads might be tracking.
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Old 30-01-2009   #38
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Re: Rough running

Hate to say this, but it could be head gasket or burnt valve seats if you have a slight misfire that disappears at higher revs. Do you have access to a compression tester?
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Old 30-01-2009   #39
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Re: Rough running

I hate hearing you say that! Lol, I can ask a friend if he has one. Thanks.
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Old 31-01-2009   #40
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Re: Rough running

Ok just pulled the plugs - I couldn't resist even though its late.

On inspection they seem as though they have normal wear, all except the third cylinder (bottom picture)
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Old 31-01-2009   #41
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Re: Rough running

Do a compression test and 'sniff' test just to rule out anything nasty.
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Old 31-01-2009   #42
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Re: Rough running

I changed the plugs today from the old Fiat/Lancia type to NGK and the misfire has disappeared.

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Old 31-01-2009   #43
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Re: Rough running

Ad, goes to show that 99% of issues are the simple things! Glad its sorted!
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Old 31-01-2009   #44
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Re: Rough running

Nice to hear a simple solution!
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Old 31-01-2009   #45
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Re: Rough running

Yeah I'm glad too, I was nearly tearing my hair out! Must have always been a faulty plug on cylinder 3 even from new! NGK have never let me down.

I just want to take this opportunity to thank every one for their input, you have all been very helpful.

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