Jerking while accelerating

adya33 · 13th December 2005, 09:10

Hello everybody,

Today morning when I was driving (surrounding temperature around 15C) my car (Opel Astra) was jerking very heavily whe engine was cold.
Specially when I slowed down for some reason & start to accelerate again it would jerk very heavily as if there is no petrol (there was about 15 litres of petrol). And it was running fine then after
Me not being a morning person this was the first time I was driving car at such low temperature this season. Last year I can not think of any such problem.
Usually when I leave for collage the temperature is around in lowed 20s, no problem that time.
Recently I have had fuel filter changed.
I drive light footed.

On my way back when engine was warm no issues.

Could anyone please help ?
Thank you in advance

Shan2nu · 13th December 2005, 10:02

It used to happen on our "Carb Esteem" but, never on the Vtec, Wagon R or Innova (which are all MPFIs).

I hope you let the engine idle a bit before you move on.

Shan2nu

tifosikrishna · 13th December 2005, 10:08

ya shan2u was right. nonetheless, its always a better practice to let the engine run idle for a minute or two to allow lubricants get to working temperature especially if the engine is cranked after long period of time.

jkdas · 13th December 2005, 10:08

Never happened to me with newer cars with MPFI. Maybe your car wasnt an MPFI one and hence the problem. We used to warm up our old Fiat's thought before a drive.

Rtech · 13th December 2005, 10:25

Adya, you better cross your fingers and hope that this is not what I think it is.

Used to happen to my Astra every 2 years. Just before the Ignition module went on the blink and costs Rs.4,000 to get a new one. If Its not the ignition module, then it could be the fuel pump, which happenend to my car as well.

skidrock · 13th December 2005, 14:10

Not to hijack this thread or anything, my Zen MPFI (2001, 60k) started doing the same after I changed the engine oil to Castrol GTX Magnatec. Not very heavy jerking but the auto-choke will be on during that time and if I try to accelerate it does jerk. Is it normal ??

angelfire · 14th December 2005, 13:27

hey adya...
you just got run the engine for some time...specially in a carb engine...once the temp gauge starts movin..everythin wil be just fine..nd please dnt accelrate as soon as you start movin...its not such good thin to do when the engine is cold..

adya33 · 14th December 2005, 15:26

Thank you everyone for your suggetions

RTech: I will get fuel pump checked as soon as I get little free time also is there any way to get ignition module?

adya33 · 2nd January 2006, 18:03

Quote:

Originally Posted by nishweths

Hai adya even my 1996 astra which has done 100000km has the same jerking problem as yours.It dissepears when the engine is hot.I regularly use System-G then also the problem persists.How did you rectify this particular problem.Please tell me as soon as possible as it is very difficuilt to drive the car.

Nishweth

Like RTech said my cars problem was related to ignition module
My mechanic has put a temporary ignition module and problem has appeared to be gone
so that was most likely

Otherwise you may wait till engine gets hot

.anshuman · 2nd January 2006, 21:12

thats very abnormal for a fuel injected car,but for a carburetted one its goodmorning stuff,check out all the sensors in your car if they are working fine,it can be due to some lose connector.

adya33 · 11th January 2006, 12:16

Quote:

Originally Posted by nishweths

Adya how is the jerking of your opel astra is it ok or still there.I have started warming up my car in the morning before moving and this has cured my problem.My mechanic told me it is not a problem but due to single point fuel injection.

Nishweth

could you please ask your mechanic as what he ment by "due to single point fuel injection"

because
Astra is not carburatted, it has an ECU
so technically speaking this problem should not be there

adya33 · 11th January 2006, 17:47

replacing fuel filter, air filter doesn't make sence if you ask me if car isn't jerking once engine is up to temprature

as for warming up I am pretty sure Astra doesn't need it. My mechanic (ex-Opel service manager) has confirmed it & also stated in car manual (will confirm it by tomorrow if anyone needs it)

timing belt on my car has been replaced but i can't remember the milage at which it was done, all parts on my car (even if replaced are stock - execpt tyres)

starting problem is not present in my car but I have had battery changed in recently

KS Motorsport · 4th March 2006, 10:42

Hello,
Get the following done.
1)De-carbonize the engine
2)Clean the injector
3)Change the plugs
4)Clean the throttle body

These things should solve ur problems

Karan

rareone · 4th March 2006, 11:06

Hi,

my friend had a similar problem like this

If u feel the trouble while acceleration while the car is in movement thn u need 2 throughly check the Spark Plugs And also the connecting cables.

There cud b a problem with tht.

Enjoy Revving...

nitrous · 4th March 2006, 11:24

Check ur Ignition coil and spark plugs &cables.

I suspect them.

13th December 2005, 09:10	#1
adya33 Senior - BHPian Join Date: Apr 2005 Location: Pune Posts: 1,842 Thanked: 33 Times	Cold engine jerking problem Hello everybody, Today morning when I was driving (surrounding temperature around 15C) my car (Opel Astra) was jerking very heavily whe engine was cold. Specially when I slowed down for some reason & start to accelerate again it would jerk very heavily as if there is no petrol (there was about 15 litres of petrol). And it was running fine then after Me not being a morning person this was the first time I was driving car at such low temperature this season. Last year I can not think of any such problem. Usually when I leave for collage the temperature is around in lowed 20s, no problem that time. Recently I have had fuel filter changed. I drive light footed. On my way back when engine was warm no issues. Could anyone please help ? Thank you in advance
	() Thanks

13th December 2005, 10:02	#2
Shan2nu Senior - BHPian Join Date: Feb 2004 Location: Hubli - Karnata Posts: 5,509 Thanked: 15 Times View My Garage	It used to happen on our "Carb Esteem" but, never on the Vtec, Wagon R or Innova (which are all MPFIs). I hope you let the engine idle a bit before you move on. Shan2nu
	() Thanks

13th December 2005, 10:08	#3
tifosikrishna BHPian Join Date: Oct 2005 Location: chennai Posts: 627 Thanked: 24 Times View My Garage	ya shan2u was right. nonetheless, its always a better practice to let the engine run idle for a minute or two to allow lubricants get to working temperature especially if the engine is cranked after long period of time.
	() Thanks

13th December 2005, 10:08	#4
jkdas Distinguished - BHPian Join Date: Sep 2005 Location: Thiruvananthapuram-Shertalla! Posts: 8,959 Thanked: 462 Times View My Garage	Never happened to me with newer cars with MPFI. Maybe your car wasnt an MPFI one and hence the problem. We used to warm up our old Fiat's thought before a drive.
	() Thanks

13th December 2005, 10:25	#5
Rtech Team-BHP Support Join Date: Apr 2004 Location: Bombay Posts: 5,768 Thanked: 68 Times View My Garage	Adya, you better cross your fingers and hope that this is not what I think it is. Used to happen to my Astra every 2 years. Just before the Ignition module went on the blink and costs Rs.4,000 to get a new one. If Its not the ignition module, then it could be the fuel pump, which happenend to my car as well.
	() Thanks

13th December 2005, 14:10	#6
skidrock BHPian Join Date: Aug 2004 Location: Hyderabad Posts: 42 Thanked: 0 Times	Not to hijack this thread or anything, my Zen MPFI (2001, 60k) started doing the same after I changed the engine oil to Castrol GTX Magnatec. Not very heavy jerking but the auto-choke will be on during that time and if I try to accelerate it does jerk. Is it normal ??
	() Thanks

14th December 2005, 13:27	#7
angelfire BHPian Join Date: Sep 2005 Location: Mangalore/Chicago Posts: 251 Thanked: 0 Times View My Garage	hey adya... you just got run the engine for some time...specially in a carb engine...once the temp gauge starts movin..everythin wil be just fine..nd please dnt accelrate as soon as you start movin...its not such good thin to do when the engine is cold..
	() Thanks

14th December 2005, 15:26	#8
adya33 Senior - BHPian Join Date: Apr 2005 Location: Pune Posts: 1,842 Thanked: 33 Times	Thank you everyone for your suggetions RTech: I will get fuel pump checked as soon as I get little free time also is there any way to get ignition module?
	() Thanks

2nd January 2006, 21:12	#10
.anshuman Team-BHP Support Join Date: Dec 2004 Location: Good-Gaon Posts: 6,262 Thanked: 2,599 Times View My Garage	thats very abnormal for a fuel injected car,but for a carburetted one its goodmorning stuff,check out all the sensors in your car if they are working fine,it can be due to some lose connector.
	() Thanks

11th January 2006, 17:47	#12
adya33 Senior - BHPian Join Date: Apr 2005 Location: Pune Posts: 1,842 Thanked: 33 Times	replacing fuel filter, air filter doesn't make sence if you ask me if car isn't jerking once engine is up to temprature as for warming up I am pretty sure Astra doesn't need it. My mechanic (ex-Opel service manager) has confirmed it & also stated in car manual (will confirm it by tomorrow if anyone needs it) timing belt on my car has been replaced but i can't remember the milage at which it was done, all parts on my car (even if replaced are stock - execpt tyres) starting problem is not present in my car but I have had battery changed in recently
	() Thanks

4th March 2006, 10:42	#13
KS Motorsport BHPian Join Date: Jun 2004 Location: Mumbai Posts: 110 Thanked: 2 Times	Hello, Get the following done. 1)De-carbonize the engine 2)Clean the injector 3)Change the plugs 4)Clean the throttle body These things should solve ur problems Karan
	() Thanks

4th March 2006, 11:06	#14
rareone BHPian Join Date: Oct 2005 Location: Navi Mumbai Posts: 256 Thanked: 11 Times View My Garage	Hi, my friend had a similar problem like this If u feel the trouble while acceleration while the car is in movement thn u need 2 throughly check the Spark Plugs And also the connecting cables. There cud b a problem with tht. Enjoy Revving...
	() Thanks

4th March 2006, 11:24	#15
nitrous Distinguished - BHPian Join Date: May 2004 Location: London / Madras Posts: 6,839 Thanked: 143 Times View My Garage	Check ur Ignition coil and spark plugs &cables. I suspect them.
	() Thanks

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