Hesitation Below 3000rpm When Cold

[oli-pug 6 2 Cars]

got a little problemo, when the car is cold and i put my foot to the floor when the revs are below 3000, i get real bad hesitation. but when its warmed up, it pulls fine and clean with no dips

 

i checked my plugs last night and they were covered in soot and fuel. what could be the cause of the overfuelling?

 

any ideas?

Edited March 13, 2007 by oli-pug

[pip470 61]

Hi mate definatly sounds like ecu temp switch Or possibly the sad blocked. Good luck

[oli-pug 6 2 Cars]

replaced both of them last week with brand new parts ...cheers anyway

[jim21070 2]

Oli,

 

Apologies for sounding like a grumpy old fart but when cold you really shouldn't floor it. Take it a bit gentle until the engine is warm if you care about your engine Really you should not boot it until you have the oil up to temperature.

 

I reckon what you're experiencing is quite normal.

[oli-pug 6 2 Cars]

i didnt mean i was taking it upto the redline when cold. i never take it past 3-3500 until the engine and oil are up to temp

 

for example; im in 2nd gear at 1500rpm at a junction on a blind bend, and i needed to give it some juice to avoid been hit by a lorry. the car just hesitates and sends me bouncing up the road until it reaches 3000 and smoothes out then i change gear.

 

i was thinking maybe a tps problem?

[pug_ham 244 3 Cars]

The tps on jetronic is a simpe open / closed switch so I'd be surprised if it was that causing a mid range problem.

 

The test procedure for it has been posted on here a couple of times before if you need it but its also in the haynes manual. All you need is a multimeter for it.

 

Both the sooty plugs & hesitation could be caused by a badly adjusted AFM imo?

 

Graham.

[oli-pug 6 2 Cars]

i recently replaced the afm and it seemed good for about 500 miles now its running very badly and rich again.

 

would it just be the mixture screw thats badly adjusted? or to do with the carbon track etc... i tried retracking it but didnt take note of how far up the track it should be when the flap is closed. could it be a case of been badly postioned on the track

[j_turnell 137 3 Cars]

Was the car set up after swapping the afm as its not just a plug and play as it was set up for a different engine, worth getting the Co checked if this is the case.

[pug_ham 244 3 Cars]

Did you get the right AFM for your engine/ car?

 

Post the number so we can check.

 

If it is right, check the pins in the plugs are seated correctly. Also the link wire between the distributor field windings & coil as this plug has a tendency to get damp which can cause similar issues.

 

Graham.

[oli-pug 6 2 Cars]

yeh its the right afm (1.6 0280202056)

 

ill check it on the co meter at college tomorrow and check the pins too

 

thanks