1.8 cav 1995 multec engine problems

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steviedarley

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Hi there, I own a cav 95 for the last 3 years I have had jerking problem the same as I have read on this site but slightly different as in no engine light, no fault codes. When it first started it was hardly noticeble, 3 years later the cars undrivable. Over the years it has had dizzy cap, new plugs, fuel filter, injector cleaner, different injector, (£10 ebay) just recently, mobile tuning EXPERT 2 years ago, (messed with stepper motor nearly blew engine up) £40 lighter no cure, cleaned all the earth connections I can find, took it to a small garage/unit 11/7/06 put magic box on AGAIN could not find anything out of place ( nice lad) did not charge me after 1 1/2 hours fault finding. One of his lads (after work vauxhall nut) says it could be Manifold Absolute Pressure Sensor, (where is that) £51 0ff the net. Lad I know is pointing me towards Crank Sensor, (know where that is and looks a pig to do) £40 + off net. Noticed the display on magic box said fuel... LEAN, jerks from O to 50 mph light throttle usage, obviously above 50mph + the jerking appears less because engine running faster. Dizzy cap was first thing to change nearly 3 years ago didnt make any difference. Any help would be appreciated. Steve.
 
Hi there, I own a cav 95 for the last 3 years I have had jerking problem the same as I have read on this site but slightly different as in no engine light, no fault codes. When it first started it was hardly noticeble, 3 years later the cars undrivable. Over the years it has had dizzy cap, new plugs, fuel filter, injector cleaner, different injector, (£10 ebay) just recently, mobile tuning EXPERT 2 years ago, (messed with stepper motor nearly blew engine up) £40 lighter no cure, cleaned all the earth connections I can find, took it to a small garage/unit 11/7/06 put magic box on AGAIN could not find anything out of place ( nice lad) did not charge me after 1 1/2 hours fault finding. One of his lads (after work vauxhall nut) says it could be Manifold Absolute Pressure Sensor, (where is that) £51 0ff the net. Lad I know is pointing me towards Crank Sensor, (know where that is and looks a pig to do) £40 + off net. Noticed the display on magic box said fuel... LEAN, jerks from O to 50 mph light throttle usage, obviously above 50mph + the jerking appears less because engine running faster. Dizzy cap was first thing to change nearly 3 years ago didnt make any difference. Any help would be appreciated. Steve.

air getting into the fuelline??
 
bongo said:
Hi there, I own a cav 95 for the last 3 years I have had jerking problem the same as I have read on this site but slightly different as in no engine light, no fault codes. When it first started it was hardly noticeble, 3 years later the cars undrivable. Over the years it has had dizzy cap, new plugs, fuel filter, injector cleaner, different injector, (£10 ebay) just recently, mobile tuning EXPERT 2 years ago, (messed with stepper motor nearly blew engine up) £40 lighter no cure, cleaned all the earth connections I can find, took it to a small garage/unit 11/7/06 put magic box on AGAIN could not find anything out of place ( nice lad) did not charge me after 1 1/2 hours fault finding. One of his lads (after work vauxhall nut) says it could be Manifold Absolute Pressure Sensor, (where is that) £51 0ff the net. Lad I know is pointing me towards Crank Sensor, (know where that is and looks a pig to do) £40 + off net. Noticed the display on magic box said fuel... LEAN, jerks from O to 50 mph light throttle usage, obviously above 50mph + the jerking appears less because engine running faster. Dizzy cap was first thing to change nearly 3 years ago didnt make any difference. Any help would be appreciated. Steve.

air getting into the fuelline??
Click to expand...

A while back my Omega would try and rattle itself to bits at any revs below 2000 or above 2500 when under load, no EML; at least vaguely similar to your symptoms. Turned out to be HT leads. 25 quid from local motor factors.
 
bongo said:
Hi there, I own a cav 95 for the last 3 years I have had jerking
problem the same as I have read on this site but slightly different as
in no engine light, no fault codes. When it first started it was hardly
noticeble, 3 years later the cars undrivable. Over the years it has had
dizzy cap, new plugs, fuel filter, injector cleaner, different
injector, (£10 ebay) just recently, mobile tuning EXPERT 2 years ago,
(messed with stepper motor nearly blew engine up)
£40 lighter no cure, cleaned all the earth connections I can find,
took it to a small garage/unit
11/7/06 put magic box on AGAIN could not find anything out of place (
nice lad) did not charge me after 1 1/2 hours fault finding. One of his
lads (after work vauxhall nut) says it could be Manifold Absolute
Pressure Sensor, (where is that) £51 0ff the net. Lad I know is
pointing me towards Crank Sensor, (know where that is and looks a pig
to do) £40 + off net.
Noticed the display on magic box said fuel... LEAN, jerks from O to 50
mph light throttle usage, obviously above 50mph + the jerking appears
less because engine running faster.
Dizzy cap was first thing to change nearly 3 years ago didnt make any
difference.
Any help would be appreciated. Steve.

air getting into the fuelline??
Click to expand...
 
Hi bongo, you are not the first to mention air getting into fuel line. cant get my head round it though, If the fuel is under pressure and air is getting in then surely fuel should be coming out where the air is going in. (no)? First time on here so dont know where this reply will go.
 
Hi bongo, you are not the first to mention air getting into fuel line. cant get my head round it though, If the fuel is under pressure and air is getting in then surely fuel should be coming out where the air is going in. (no)? First time on here so dont know where this reply will go.
 
Thanks for your reply to my problem, you just reminded me the ht leads was the second thing I replaced 3 years ago then the plugs. Had Montego with same problem changed dizzy cap no more problem.
 
spark plugs, leads, coilpack or coils, oxygen sensor [if fitted]

mike

Hi there, I own a cav 95 for the last 3 years I have had jerking problem the same as I have read on this site but slightly different as in no engine light, no fault codes. When it first started it was hardly noticeble, 3 years later the cars undrivable. Over the years it has had dizzy cap, new plugs, fuel filter, injector cleaner, different injector, (£10 ebay) just recently, mobile tuning EXPERT 2 years ago, (messed with stepper motor nearly blew engine up) £40 lighter no cure, cleaned all the earth connections I can find, took it to a small garage/unit 11/7/06 put magic box on AGAIN could not find anything out of place ( nice lad) did not charge me after 1 1/2 hours fault finding. One of his lads (after work vauxhall nut) says it could be Manifold Absolute Pressure Sensor, (where is that) £51 0ff the net. Lad I know is pointing me towards Crank Sensor, (know where that is and looks a pig to do) £40 + off net. Noticed the display on magic box said fuel... LEAN, jerks from O to 50 mph light throttle usage, obviously above 50mph + the jerking appears less because engine running faster. Dizzy cap was first thing to change nearly 3 years ago didnt make any difference. Any help would be appreciated. Steve.
 
Hi mike, plugs & leads made no difference. old cars years ago use to suffer coil problems but still a possibility. Could go down the oxy sensor road but would that not show on the magic box thats just been pluged into the car ?.
 
Has it got an egr valve fitted?
Late Astras give similar symptoms when egr is knackered.

Hi there, I own a cav 95 for the last 3 years I have had jerking problem the same as I have read on this site but slightly different as in no engine light, no fault codes. When it first started it was hardly noticeble, 3 years later the cars undrivable. Over the years it has had dizzy cap, new plugs, fuel filter, injector cleaner, different injector, (£10 ebay) just recently, mobile tuning EXPERT 2 years ago, (messed with stepper motor nearly blew engine up) £40 lighter no cure, cleaned all the earth connections I can find, took it to a small garage/unit 11/7/06 put magic box on AGAIN could not find anything out of place ( nice lad) did not charge me after 1 1/2 hours fault finding. One of his lads (after work vauxhall nut) says it could be Manifold Absolute Pressure Sensor, (where is that) £51 0ff the net. Lad I know is pointing me towards Crank Sensor, (know where that is and looks a pig to do) £40 + off net. Noticed the display on magic box said fuel... LEAN, jerks from O to 50 mph light throttle usage, obviously above 50mph + the jerking appears less because engine running faster. Dizzy cap was first thing to change nearly 3 years ago didnt make any difference. Any help would be appreciated. Steve.
 
Hi, yes it has EGR, when I took the car in on the 11th car was picked up by daughter-in-law so never got speak to anyone. All the replies on this problem are pointing towards sensors that I dont know if they would have picked up on when the box was plugged in to the car. I have been told crank sensor would not show, As for EGR, Haynes show you how to test it. Best thing would be to to find same spec car in scap yard and get all the bits suggested by everybody. Many thanks. Steve.
 
Hi bongo, you are not the first to mention air getting into fuel line. cant get my head round it though, If the fuel is under pressure and air is getting in then surely fuel should be coming out where the air is going in. (no)? First time on here so dont know where this reply will go.

You have a fuel pump. the pump sucks fuel in the inlet and forces it out under pressure at the outlet. if you have a leak between pump and engine, fuel under pressure leaks out. If you have a leak between the inlet and the tank it will suck air in. Try sticking a pinhole in a plastic straw and then use it to drink a can of coke to see the effect.

Mike
 
Hi Mike, Thanks for the explaination. I changed the fuel filter a couple of months ago thinking it could be that, I thought i found the problem when i noticed the filter the wrong way round, alas it wasnt to be. I checked the rubber hoses to and from the filter and made sure they were secure after new filter was fitted, the car was just the same. Steve.
 
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