Mivec Range

G_A_V · Post by **G_A_V** » Thu Mar 25, 2004 12:53 pm

does anyone find their car is very jerky when its cold ?? or when its first started ?? and the exhaust is really loud at around 3.5k ??
I find my car is very hard to drive when cold unless i acclerate, its very jerky, and it will idle as high as 2.5k sometimes for a few secs

G1 · Post by G1 » Thu Mar 25, 2004 1:09 pm

well i personally dont have the time to let it idle longer than about 15-30sec in the morning rush - at least give the oil time to circulate

according to ruchi, maybe this was a good thing haha

FTO338 · Post by **FTO338** » Thu Mar 25, 2004 1:26 pm

Hey ruchi, will those theory change if you use oil addictive? I'm aware there are few ppl here use them.

ruchi · Post by **ruchi** » Thu Mar 25, 2004 1:41 pm

Short answer:
no

Long answer:
While the oil additives should help by increasing viscosity thereby reducing engine wear, you still want to get your engine up to operating temperature as quickly as posible to create the seal between the piston rings and the chamber walls. Until this seal occurs the air/fuel mixture can contanimate the oil and the pressure of the compression will also be lower.

FTO338 · Post by **FTO338** » Thu Mar 25, 2004 2:09 pm

Thax Bro, now i get extra 15mins of sleep in the morning

ruchi · Post by **ruchi** » Thu Mar 25, 2004 2:17 pm

GPXXX · Post by **GPXXX** » Thu Mar 25, 2004 2:59 pm

G_A_V wrote:does anyone find their car is very jerky when its cold ?? or when its first started ?? and the exhaust is really loud at around 3.5k ??
I find my car is very hard to drive when cold unless i acclerate, its very jerky, and it will idle as high as 2.5k sometimes for a few secs

mine does.. apparently it's the clutch - it bites more when it's cold, but starts to slip a little when warmed up (which s why it's smoother on the pickup). It depends on how brutal you are on the clutch, if you pop it during accel. when the car is cold, then yes it will jerk... Seems to occur on other cars too...

G_A_V · Post by **G_A_V** » Thu Mar 25, 2004 3:04 pm

not only then, but when i have the clutch fully engaged (foot completly off) and i slowly accelerate in first gear it will acclerate quick and then slow down a little if you know what i mean. So usually i justh ave to drive with my foot flat to the floor and change gears quickly (at lowwer revs) otherwise the car speeds up and slows down a lot when i have half throttle when its cold

GPXXX · Post by **GPXXX** » Thu Mar 25, 2004 3:57 pm

hmmm, mine seems to jerk only on the clutch pickup in 2nd... and that's after 3mins warm up and pulling out of the car park

but no such problem like urs on partial throttle in 1st gear though'...

dannyboyau · Post by **dannyboyau** » Thu Mar 25, 2004 9:09 pm

oops

i should have explained more clearly

I t has a lot more to do with the differant rates of thermal expansion for the differant engine parts. Plus the viscosity of the oil when cold. for example your piston will heat up much quicker than your block and the clearances between the piston and the piston wall will get smaller then they would be once the block reaches operating temperature, during this time if you push it too hard you will get more wear than you would once it gets hot

but basicly dont thrash you engine when it is cold or you will wear it out

RichardH · Post by **RichardH** » Sun Mar 28, 2004 12:42 pm

G_A_V wrote:not only then, but when i have the clutch fully engaged (foot completly off) and i slowly accelerate in first gear it will acclerate quick and then slow down a little if you know what i mean. So usually i justh ave to drive with my foot flat to the floor and change gears quickly (at lowwer revs) otherwise the car speeds up and slows down a lot when i have half throttle when its cold

Yeah, mine's always done that. 4 years now, and no hint that there's an issue.

I just does it for a few seconds the first time when stone cold on a chilly morning.

- Rich

payaya · Post by **payaya** » Sun Mar 28, 2004 8:56 pm

G_A_V wrote:not only then, but when i have the clutch fully engaged (foot completly off) and i slowly accelerate in first gear it will acclerate quick and then slow down a little if you know what i mean. So usually i justh ave to drive with my foot flat to the floor and change gears quickly (at lowwer revs) otherwise the car speeds up and slows down a lot when i have half throttle when its cold

check your idle speed controller.

i know what you mean i have the same problem, power delivery isnt smooth, revs seems to rise and drop.

Also you dont need to warm up a modern engine. Engines of the past yes, its not neccessary these days.

When your engine is warm you got to think your tansmission oil is still cold. It takes around 15-20 mintues for tranny oil to totally heat up.