Cold starting problems
06 January 2010, 09:41 AM
#1
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Cold starting problems
It currently takes about 3 to 4 attempts to start the car when cold, any idea what to check or where to start?
It has new plugs and a new lambda.
It also seems pretty rich on idle, (2% co with CAT installed)
Cheers
Dave
It has new plugs and a new lambda.
It also seems pretty rich on idle, (2% co with CAT installed)
Cheers
Dave
06 January 2010, 11:52 AM
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Yeah it was doing it before the plugs and Lambda change, another Lambda has been tested as well, also it does it with and without a CAT.
What can i check with the crank sensor ?
What can i check with the crank sensor ?
06 January 2010, 09:52 PM
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sounds like coolant temp sensor, its on the water crossover pipe ,below the inlet manifold,,near the turbo,,,,there are 2 fittings in there i think . bit of a bugger to get at .
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07 January 2010, 10:47 AM
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The plot thickens, today it was not running well at all, ok if lightly driven but if i applied half throttle to start accelerating it would start back firing and bucking, feels like when the knock sensor was dodgy and it was activating limp mode. I will check the ecu codes at lunch and see if anything is thrown up.
Dave
Dave
08 January 2010, 04:56 PM
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i had exactly the same problem on my94 changed coil packs, and plugs with no joy. turned out to be low compression in one of the cylinders (piston ring), do a compression test just to rule it out only takes an hour then atleast its rulled out.
08 January 2010, 05:02 PM
#14
If your mixture's too rich then logically that means you're not getting enough air (t'other side of the same coin really) so air filter would normally be the first thing to check or replace.The poor cold starting would then most likely be due to the plugs getting fouled, which is par for the course with a rich mixture.
11 January 2010, 10:47 AM
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OK i had more problems on Friday, the misfire under load was getting worse and I couldn't start it when i left work, so on Saturday i came back and tried to start it but still no joy! It was turning over fine but not firing.
Got the nice RAC man out and he diagnosed it in about 10 minutes! I had a spark but no fuel, so he walloped the tank and hey presto it started, he said he had seen this beofre with intank pumps, my fuel pump was not working very well thus could not deliver enough fuel to the engine! So i fitted the high pressure fuel pump i had sitting around at home and now its running great!!
I dont know if this will help the emissions problem? but i will find out today as its in for MOT again!
Dave
Got the nice RAC man out and he diagnosed it in about 10 minutes! I had a spark but no fuel, so he walloped the tank and hey presto it started, he said he had seen this beofre with intank pumps, my fuel pump was not working very well thus could not deliver enough fuel to the engine! So i fitted the high pressure fuel pump i had sitting around at home and now its running great!!
I dont know if this will help the emissions problem? but i will find out today as its in for MOT again!
Dave
12 January 2010, 12:54 PM
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Car is still a bit hard to start and was spluttering a bit when cold, so CTS ordered!
But with the high flow fuel pump fitted its now going very well, the tubular headers have moved the power band up a bit, but it feels very quick through the gears now!
Dave
But with the high flow fuel pump fitted its now going very well, the tubular headers have moved the power band up a bit, but it feels very quick through the gears now!
Dave
15 January 2010, 10:22 PM
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Had the cold start problem on my 1994 wrx changed the CTS and starts first time all the time and i fitted it about 6 weeks ago. Hope its that for you as a cheap fix for a change.
Neil
Neil
19 January 2010, 02:10 PM
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Well i think it seems to have fixed my cold start problem but the car if still not right!
i think its still too rich at idle and so i dont get any pops and bangs when letting off. The only real change is the tubular manifold.
Also when i leave work, and only when i leave work, about 5:30 i get alot of missing until it is a bit warmer!
getting frustrated now!
Dave
i think its still too rich at idle and so i dont get any pops and bangs when letting off. The only real change is the tubular manifold.
Also when i leave work, and only when i leave work, about 5:30 i get alot of missing until it is a bit warmer!
getting frustrated now!
Dave
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