car jerking

[tj]

Hi,

I have just changed my spark plugs. After changing them i drove the car and the car started to jerk when accerlating.

So i changed the HT Leads but the problem still persists!

Any ideas what could be causing this?

Please help

cheers

TJ

[inder]

Make sure all leads are in correct order?

Re-check plugs are seated correctly and not cross-threaded? Is the gap set correctly?

Replace everything with the old bits and see if problem is still there?

[david burton]

distributor cap and rotor arm could be worn - this would cause that too

[tj]

cheers for the reply.

i got the plugs checked and they are ok. the garage said that the gaps should be standard.

only problem with replacing with old bits is that i only have 3 of the 4 plugs! if i leave one of the news one in there and replace other 3 with old should that make a difference?

just about the distributor cap and arm rotor would that cause themn problems if i have only replaced the plugs.

leads are in the correct order as well

any replies would be much appreciated as i am stuck

cheers

[BLACK6N_POLO]

i had this jerking happen to me a few times -when does it happen exactly- because mine only happens in first gear-- i have not chnged any leads spark plugs or caps -- does this mean i need to

plz help if u can

[tj]

Hi

mine jerks when accerlating but it only happens sometimes when i drive especially when going up a small hill or something. happens on a daily basis though but is random

so i normally just turn the car off and back on then it seems ok for a bit

just a copy from the above i got the plugs checked and they are ok. the garage said that the gaps should be standard. plugs are ngk states that they are preset on their website!

only problem with replacing with old bits is that i only have 3 of the 4 plugs! if i leave one of the news one in there and replace other 3 with old should that make a difference?

just about the distributor cap and arm rotor would that cause themn problems if i have only replaced the plugs.

leads are in the correct order as well

any replies would be much appreciated as i am stuck

cheers

[tj]

another note from the above
oh yeah that day i now remember that there was a blue lead which i released was an alarm lead it was connect to the bonnet where there is a latch. all i did here was reearth it. I moved the wire from the bottom of the latch to the top???

could this be the cause?

[inder]

put it back where it was originally (why did you move it?) and see if still happens? to eliminate it

normally boot bits of the alarm are connected to little switches, so that if bonnet is opened, alarm goes off

[tj]

Hi

I will do that but when driving the car on friday it was fine after a while.

it started to jerk as normal i stopped the car and it was ok. but when you quickly put your foot down you miss the jerks. Only when you accelrating slowly it happens around 2000rpm. After driving for a while on friday it was ok but then it happened again. When stopping the car and restarting it, it was then ok. I noticed the temp guage dropped a little bit between 70-90. Normally it always on 90 once heated up could this be related.

i will put the wire back to eliminate the problem but i went to car alarm shop they said this doesnt affect it

cheers

[inder]

Perhaps your temp sensor has gone, cheap to replace

Not sure to be honest

[tj]

Hi

I changed the temp sensor yesterday! it seems ok at the mo but i canfeel slight hestitation in accerlation bu very minimum. im going to see how it goes if it comes back then will put old plugs in.

Also another question, in the morning when starting the car, i reve the car but when taking foot of gas the revs drop and car turns off! what could be causing this? also when driving when i change gears the revs drop but go back up. when its warm enough it stays at 900rpm but does vary

any ideas?

cheers

TJ

[david burton]

a quick and easy problem-solving method for many hesitation and jerking problems is to take the distributor cap off (very easy to do) and squirt WD40 into it, then dry with a lint-free cloth.

oftern moisture gets trapped in there and the spark has more resistance, so under load the car misses. the WD40 removes moisture - it's a superb electrical-solving can of tricks!

[tj]

yeah will try that as well cheers!

i cleaned it with a cloth last week but didnt do much! also sanded down a bit of the contacts which were not proper clean!

just puzzled as to why it started to happen when i changed the spark plugs?

[tj]

hi

finished work today and i stalled the car when i started it as it was in gear! doh! but what happened is the time reset along with journey miles! why would this happen?

then car started to jerk again when accelarting then stops once constant accelration!!!

its only when u put ure foot on gas then when it reaches some spped ok!

turned car off and back on and it was fine just slight!

could it be something else causing it??? electrical????

im just thinking that the ecu might have reset when i disconnected the battery when changing the plugs! not sure if this had a knockon effect anywhere else!

TJ

[Phatman]

When you disconnect the battery the settings are lost and it takes a while for the ECU to re learn the settings for your car. It will idle lumpy until it compensates, it all depends how much it was compensating in the first place. It should sort itself out after about a week. BTW don't be tempted to remove the ECU otherwise you will have to re-enter the imobilser codes and have it reset...