Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: ScottieMV6 on 14 April 2010, 10:00:12

Title: Misfire/Hesitation at 4000 rpm
Post by: ScottieMV6 on 14 April 2010, 10:00:12
Took my car back to MOT station this morning for retest and on the way there was a misfire/hesitation at 4000 rpm.

Idles and runs fine up to 4000 but then its as if it wants to cut out.

Any thoughts much appreciated :y
Title: Re: Misfire/Hesitation at 4000 rpm
Post by: Marks DTM Calib on 14 April 2010, 10:09:11
Any fault codes?

Is the fuel filter nice and new or old, manky and blocked?

Was the cemblet timing all set up correctly?
Title: Re: Misfire/Hesitation at 4000 rpm
Post by: ScottieMV6 on 14 April 2010, 10:20:08
Its still at the MOT station at the minute so can't check for fault codes. Fuel filter could probably do with a change. Cambelt timing all set up correctly as far as I know (though I did it myself following the DVD so could be completely wrong) :D :D
Title: Re: Misfire/Hesitation at 4000 rpm
Post by: ScottieMV6 on 14 April 2010, 18:31:51
Got the car back and checked codes. It showed 46 which is SAI (still can't work out what is causing that) and 19. Cleared codes and ran the car again and only 46 came back.

Stuck with this now.  :-/ :-/
Title: Re: Misfire/Hesitation at 4000 rpm
Post by: cem_devecioglu on 14 April 2010, 18:35:31
sensor problem..and cam sensor is #1 candidate imo..
Title: Re: Misfire/Hesitation at 4000 rpm
Post by: Marks DTM Calib on 14 April 2010, 18:41:59
Disagree Cem....crank sensor is faulty!

But change the fuel filter
Title: Re: Misfire/Hesitation at 4000 rpm
Post by: cem_devecioglu on 14 April 2010, 18:48:42
Quote
Disagree Cem....crank sensor is faulty!

But change the fuel filter

ok here is the bet 10 £ from me ;D :y
Title: Re: Misfire/Hesitation at 4000 rpm
Post by: Andy H on 14 April 2010, 19:46:26
Worth checking that the crank sensor plug/connector is firmly in place.

My guess is that (as heat damage to the crank sensor cable has been cited as a cause of crank sensor failure) moving cables around to get the head gaskets changed has accelerated the demise of the cable.
Title: Re: Misfire/Hesitation at 4000 rpm
Post by: Marks DTM Calib on 14 April 2010, 20:10:37
Quote
Quote
Disagree Cem....crank sensor is faulty!

But change the fuel filter

ok here is the bet 10 £ from me ;D :y

Easy money as code 19's NEVER occur without good reason  :y
Title: Re: Misfire/Hesitation at 4000 rpm
Post by: cem_devecioglu on 14 April 2010, 20:15:53
Quote
Quote
Quote
Disagree Cem....crank sensor is faulty!

But change the fuel filter

ok here is the bet 10 £ from me ;D :y

Easy money as code 19's NEVER occur without good reason  :y

no code 19 mentioned in the original post :-?

ok then 10 £ is yours.. :y
Title: Re: Misfire/Hesitation at 4000 rpm
Post by: Marks DTM Calib on 14 April 2010, 20:17:51
Quote
Quote
Quote
Quote
Disagree Cem....crank sensor is faulty!

But change the fuel filter

ok here is the bet 10 £ from me ;D :y

Easy money as code 19's NEVER occur without good reason  :y

no code 19 mentioned in the original post :-?

ok then 10 £ is yours.. :y

No but, scottie mentioned a 19 in his...... ;)...which is crank sensor incorrect signal
Title: Re: Misfire/Hesitation at 4000 rpm
Post by: cem_devecioglu on 14 April 2010, 20:21:22
Quote
Quote
Quote
Quote
Quote
Disagree Cem....crank sensor is faulty!

But change the fuel filter

ok here is the bet 10 £ from me ;D :y

Easy money as code 19's NEVER occur without good reason  :y

no code 19 mentioned in the original post :-?

ok then 10 £ is yours.. :y

No but, scottie mentioned a 19 in his...... ;)...which is crank sensor incorrect signal

thats not fair ;D

anyway you will get your tenner.. check your pm

by the way hesitation over 3500-4000 rpm is %90 cam sensor (I double check it) :y

Yes, camsensor will kick in limp home mode and apply a 4K rev limit, so will knock sensors (more common to see these damaged).


Never yet seen a V6 cam sensor actualy fail but, have seen them damaged due to incompitence
Title: Re: Misfire/Hesitation at 4000 rpm
Post by: Lazydocker on 14 April 2010, 20:46:26
Quote
Quote
Quote
Disagree Cem....crank sensor is faulty!

But change the fuel filter

ok here is the bet 10 £ from me ;D :y

Easy money as code 19's NEVER occur without good reason  :y

So why have I got one with (yet another) new sensor?
Title: Re: Misfire/Hesitation at 4000 rpm
Post by: Marks DTM Calib on 14 April 2010, 21:17:08
Quote
Quote
Quote
Quote
Disagree Cem....crank sensor is faulty!

But change the fuel filter

ok here is the bet 10 £ from me ;D :y

Easy money as code 19's NEVER occur without good reason  :y

So why have I got one with (yet another) new sensor?

Have you tried re-fitting it.....particularly at the block end
Title: Re: Misfire/Hesitation at 4000 rpm
Post by: ScottieMV6 on 14 April 2010, 22:02:22
So are we saying its crank sensor or cam sensor. I;ve always thought that 19 was crank sensor but Cem's description sounds exactly like my symptoms. :-/
Title: Re: Misfire/Hesitation at 4000 rpm
Post by: cem_devecioglu on 14 April 2010, 22:19:11
if you are getting 19 code , crank sensor is of primary concern as it will not let you go anywhere  soon..

with 4k limit you wont take speed ticket ;D :y
Title: Re: Misfire/Hesitation at 4000 rpm
Post by: Kevin Wood on 14 April 2010, 22:35:47
Quote
if you are getting 19 code , crank sensor is of primary concern as it will not let you go anywhere  soon..

with 4k limit you wont take speed ticket ;D :y

Cem, are you going to put your money where your mouth is again and pay mine if I try?  ;)

Kevin
Title: Re: Misfire/Hesitation at 4000 rpm
Post by: cem_devecioglu on 14 April 2010, 22:40:09
Quote
Quote
if you are getting 19 code , crank sensor is of primary concern as it will not let you go anywhere  soon..

with 4k limit you wont take speed ticket ;D :y

Cem, are you going to put your money where your mouth is again and pay mine if I try?  ;)

Kevin

 ;D ;D ;D ;D

that was a joke .. of course v6 can pass the speed limit with 4k rpm ;D :y

dont know the bigger engines gear ratios but on the 3rd sure will pass 100 km limit..

ps mine is auto