1999 2.0 turbo missfire

junkbuster · Dec 21st, 2007, 21:00

had a few problems with the car turbo did kick in at 3 -4000 rpm but dont feel it now and have a judder in low gears at low revs pulling off plugs only done 2 k coils seem ok or was told could this be a fuel filter and were is it on the car any help please when the turbo pipe to air box is dissconected at 3k you feel plenty of pressure so the vanes are ok not sure about waistegate being open help

junkbuster · Dec 28th, 2007, 19:42

help help

rogerthechorister · Dec 28th, 2007, 20:04

The judder at lower revs suggests to me that you have a misfire. That is spark or fuel.

Get a spark tester and try it on each plug in turn. That will tell you if you have sparks at all plugs. Take off the spark plug leads one at a time. If one makes no difference it might well be that plug. Change it. If you have no spares, change it for the one next door and if the fault follows the plug it's the plug, if not probably the plug cap or HT lead (or not a spark fault at all)

If you haven't changed rotor arm and HT cap, do it.

If the HT leads are naff you will probably lose a cylinder completely so if you have a spark at every plug, ignore them for the moment.

Take the leads to the injectors off one at a time. If one of them makes no difference, it might be the injector or it might be the electrical signal. If all of them make a difference go on to something else. If one was suspect, change the suspect injector with the one next to it. If the fault moves cylinders, it's the injector so change it. If the fault stays where it was its either the wire to the injector or the ECU so pray. Check the wire carefully (and its connections at both ends). Wire is more common than ECU.

I shall ignore the ECU.

Nothing else is likely to be causing juddering.

If it is just poor running rather than an actual misfire: -

Have you got any "chuffing" noises (in some cases more like a puffy ticking noise) that might be an air or vacuum leak?

Is the air filter OK?

Check the Haynes manual to locate the fuel filter. Change it or clean it if you can. It will affect fuel delivery pressure if really blocked.

Check the air mass meter and clean it.

Get a garage to test the CAT - huge back pressure could cause problems.

Is your lambda light on?

Did you get the codes read? What did they say?

Are the lambda probe(s, if your model has more than one) OK and properly connected?

Rooster · Dec 28th, 2007, 23:55

Check fuel pressure upto injection rail, should be at least 30psi (i think)

Fuel pump failing are a common problem on earlier turbo's and give symptoms you describe

shauny · Dec 29th, 2007, 15:06

I had the same fault with mine it was the coils even though they seem ok they brake down under low rpm load. If you have a URO car parts near you i would recimend them. if you do decide to change them as they are half the price of volvo and they will supply you with genuine volvo ones.

junkbuster · Dec 29th, 2007, 20:56

Quote:

Originally Posted by shauny

I had the same fault with mine it was the coils even though they seem ok they brake down under low rpm load. If you have a URO car parts near you i would recimend them. if you do decide to change them as they are half the price of volvo and they will supply you with genuine volvo ones.

thanks mate just changed air filter and fuel filter seems to be a little better now found a vac pipe loose too

Dec 21st, 2007, 21:00	#1
junkbuster New Member Last Online: Mar 29th, 2008 19:48 Join Date: Sep 2007 Location: chester	1999 2.0 turbo missfire had a few problems with the car turbo did kick in at 3 -4000 rpm but dont feel it now and have a judder in low gears at low revs pulling off plugs only done 2 k coils seem ok or was told could this be a fuel filter and were is it on the car any help please when the turbo pipe to air box is dissconected at 3k you feel plenty of pressure so the vanes are ok not sure about waistegate being open help

Dec 28th, 2007, 20:04	#3
rogerthechorister Rogerthechorister Last Online: Dec 16th, 2023 02:15 Join Date: May 2006 Location: Rochester	Your description is a bit vague! The judder at lower revs suggests to me that you have a misfire. That is spark or fuel. Get a spark tester and try it on each plug in turn. That will tell you if you have sparks at all plugs. Take off the spark plug leads one at a time. If one makes no difference it might well be that plug. Change it. If you have no spares, change it for the one next door and if the fault follows the plug it's the plug, if not probably the plug cap or HT lead (or not a spark fault at all) If you haven't changed rotor arm and HT cap, do it. If the HT leads are naff you will probably lose a cylinder completely so if you have a spark at every plug, ignore them for the moment. Take the leads to the injectors off one at a time. If one of them makes no difference, it might be the injector or it might be the electrical signal. If all of them make a difference go on to something else. If one was suspect, change the suspect injector with the one next to it. If the fault moves cylinders, it's the injector so change it. If the fault stays where it was its either the wire to the injector or the ECU so pray. Check the wire carefully (and its connections at both ends). Wire is more common than ECU. I shall ignore the ECU. Nothing else is likely to be causing juddering. If it is just poor running rather than an actual misfire: - Have you got any "chuffing" noises (in some cases more like a puffy ticking noise) that might be an air or vacuum leak? Is the air filter OK? Check the Haynes manual to locate the fuel filter. Change it or clean it if you can. It will affect fuel delivery pressure if really blocked. Check the air mass meter and clean it. Get a garage to test the CAT - huge back pressure could cause problems. Is your lambda light on? Did you get the codes read? What did they say? Are the lambda probe(s, if your model has more than one) OK and properly connected?

Dec 28th, 2007, 23:55	#4
Rooster Speed freak Last Online: Apr 3rd, 2020 22:04 Join Date: Nov 2003 Location: Yorkshire	Check fuel pressure upto injection rail, should be at least 30psi (i think) Fuel pump failing are a common problem on earlier turbo's and give symptoms you describe __________________ 04 XC90 D5 --- Big bus 00 pug 306HDi --- Run about 88 pug 309GTi --- Project track car 07 CB600 Hornet --- 2 wheel fun

Dec 28th, 2007, 19:42	#2
junkbuster New Member Last Online: Mar 29th, 2008 19:48 Join Date: Sep 2007 Location: chester	help help

Dec 29th, 2007, 15:06	#5
shauny New Member Last Online: Apr 14th, 2008 20:34 Join Date: Nov 2007 Location: swindon View Photos By: shauny	I had the same fault with mine it was the coils even though they seem ok they brake down under low rpm load. If you have a URO car parts near you i would recimend them. if you do decide to change them as they are half the price of volvo and they will supply you with genuine volvo ones.

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