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Topic: misfiring /chuffing24v (Read 1106 times) |
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colinw
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misfiring /chuffing24v
« on: Jan 1st, 2005, 1:16pm » |
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Hi guys my 24v est seems to be suffering a misfire around the 2500 rev mark but only under load i cannot seem to get it to do it whilst sat in park /nuetral ,the misfire is also accompanied by an increase in noise as though the exhaust is blowing ,its a sort of chuffing noise sorry about description but i have a hearing problem,2 weeks ago i needed a new nearside cat because old had broken up ,i have run a obd on it but dont really know how that works ,but the only error that showed up was bank 2 sensor 2 high voltage p0158 if memory is correct ,i think i can hear air somewhere but im not sure because of other normal noises ,could it be egr related!! ,it appears normal higher up rev range but noise is definitly increased under acceleration ,ive been back to exhaust centre and no leaks were found ,any suggestions would be greatly appreciated
colin
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TonyS
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Scorpio Nutter - 12 years
Posts: 96
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Re: misfiring /chuffing24v
« Reply #1 on: Jan 1st, 2005, 2:27pm » |
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Hi,
When my CAT collapsed (24v) it effectively blocked the downstream exhaust middle section (baffles) and caused similar problems.
You can try dropping the middle (and end if original) section to shake out the debris but few have had much success but it's worth a go.
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1996 Mk4 2.9 24v Estate
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colinw
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I love YaBB 1G - SP1!
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Re: misfiring /chuffing24v
« Reply #2 on: Jan 2nd, 2005, 12:58pm » |
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Tony thanks for the reply ,did the blockage on yours show up immediatly after the cat broke up ,only mine was perfect for about 1k miles after the cat was replaced ,then just started this problem ,car still seems to cruise ok higher up rev range ,but does not seem to have much low down pull
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Badboytunes
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Re: misfiring /chuffing24v
« Reply #3 on: Jan 2nd, 2005, 6:01pm » |
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may also be a faulty spark plug or ht lead giving up under load.......... happenend on my 24v
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COSWORTH_PARTS
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Re: misfiring /chuffing24v
« Reply #4 on: Jan 2nd, 2005, 6:12pm » |
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this has happened to me before with my last car
look on ebay there are some cats for sale on there
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colinw
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I love YaBB 1G - SP1!
Posts: 158
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Re: misfiring /chuffing24v
« Reply #5 on: Jan 2nd, 2005, 7:05pm » |
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thanks for replies guys ,bad boy i will get leads checked the cats have been replaced and problem has occured since ,so maybe it is the exhaust that has blocked ,but i cant see why it has taken around 1k miles to show up tho,there are no error codes apparant ,
probably get somebody to look at it on tues /weds if i have no luck ,
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COSWORTH_PARTS
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Re: misfiring /chuffing24v
« Reply #6 on: Jan 2nd, 2005, 7:28pm » |
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colin what about a lamda sensor were they replaced
drop the exhaust off after the cats this will tell you if there is a blockage in the rest of the exhaust if you are nere boston lincs i have an exhaust you could try for a day or two to see if this cures it
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colinw
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I love YaBB 1G - SP1!
Posts: 158
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Re: misfiring /chuffing24v
« Reply #7 on: Jan 2nd, 2005, 7:34pm » |
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thanks for that offer unfortunatly i am in Somerset ,and getting under the thing is not that easy for me ,lambas were replaced around 15k ago when engine was rebuilt ,
how can i tell if the rest of system is blocked when it is removed ,will it be obvious ,because it appears to go straight into a silencer,
thanks again for your assistance
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Mmonster
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Re: misfiring /chuffing24v
« Reply #8 on: Jan 2nd, 2005, 8:27pm » |
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Hello Colinw
Take the excaust pipe away from car. (it´s rather easy)
Undo 4 bolts from flangers under the car and then release 6 rubber mountings. (Please do not work under car without proper support)
Now lift the pipe upwards and shake. If you hear something loose inside, keep shaking and turning untill you get the parts out.
Note: The pipe is straight, so it´s possible to push ex. garden hose thru it.
(if you live an area where you neibors are not near, you can test to drive without pipe. Sound is great after 3500rpm  )
Mmonster
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TonyS
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Scorpio Nutter - 12 years
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Re: misfiring /chuffing24v
« Reply #9 on: Jan 3rd, 2005, 10:30am » |
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on Jan 2nd, 2005, 12:58pm, colinw wrote:| Tony thanks for the reply ,did the blockage on yours show up immediatly after the cat broke up ,only mine was perfect for about 1k miles after the cat was replaced ,then just started this problem ,car still seems to cruise ok higher up rev range ,but does not seem to have much low down pull |
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Yes it took sometime for the effects to show and for me got progressively worse as the ceramic packed down inside the middle silencer (which is a series of baffles). In the end a s/hand rear section sort of sorted but others seem to have managed to shake out the debris.
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1996 Mk4 2.9 24v Estate
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