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Author Topic: 2.5 V6 power and torque (lack of)  (Read 3039 times)

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Andy H

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Re: 2.5 V6 power and torque (lack of)
« Reply #15 on: 19 February 2010, 13:33:28 »
Quote
did you change yours yourself, andy ?

I did   :y

I would recommend that you get your front wheels up on ramps so that you can get underneath the car to get at the crank sensor.

I can't remember whether I took the scuttle off to gain access from above as well :-/.

I don't know that you actually have a failing crank sensor but given their tendency to fail when least convenient it makes a lot of sense to get a spare.

There are two types of sensor, one has an oval plug, the other has a rectangular one.

If you don't already have some then get a set of Torx/star bits because you will need one to undo the sensor retaining bolt (can't remember the size).

HTH
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Entwood

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Re: 2.5 V6 power and torque (lack of)
« Reply #16 on: 19 February 2010, 13:37:31 »
The sensors don't fail that often .. but the cables to them do !  They run VERY close to the exhaust and get overheated.

Guide suggests ignoring the original path and rerouting the cable well clear of the exhaust.

Scuttle off make it much easier. The "clip" the connector goes into can be a bit fiddly to undo.

Jack up passsenger side, stick it on an axle stand and with the passenger side front wheel off you have plenty of room to get to the sensor bolt.

HTH
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Rogusu

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Re: 2.5 V6 power and torque (lack of)
« Reply #17 on: 19 February 2010, 20:13:21 »
Hi,
don´t know if this will help. I had exactly the same problem on my 94. 2.5 Omega - lack of power and later on bad starts (first try no success, but then it started ok). I have found two problems - bad EGR valve and leaking fuel pipe (the one from engine back to tank). Due to leaking pipe the fuel system lost pressure and so the bad starts (and also very bad consumption). I haven´t tried it after the repair yet, so I do not know if the power will be better (I have bought 3.0 and the difference is HUGE :) )
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mtbskills

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Re: 2.5 V6 power and torque (lack of)
« Reply #18 on: 22 February 2010, 08:54:23 »
Thanks for the advice all  :y

Update !  did some more work this weekend, flushed and bled brake system, changed drop links, rotated tyres, and found a split in a vac hose which had been taped up previously,

Retaped hose as temp measure, and seems a little better, but may be wishful thinking

BUT.... noticed a coolant leak from passenger side of engine, down on the block somewhere   ::)
didnt have time to locate properly, but HBV seems a good guess from posts on here !  Is it located here ?

And...  very strange knocking from top end somewhere during warm up. Its ok when cold, gets very noisy when engine around 20 - 40 degrees , then fades to almost nothing when up to temp !

Sounds too Heavy to be tappets, and cam bearings would be noisy all th time I think ? Any ideas welcome ....  this is turning into a nightmare !

Oh, and have ordered a crank sensor just in case   :D
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TheBoy

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Re: 2.5 V6 power and torque (lack of)
« Reply #19 on: 22 February 2010, 09:30:32 »
Firstly, 31 can be ignored IF the car starts.  If the crank sensor is dead enough to cause a 31, it will never, ever start.

Obviously, and diesel will feel more torquey than any petrol, thats the nature of the beast.
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Varche

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Re: 2.5 V6 power and torque (lack of)
« Reply #20 on: 22 February 2010, 09:40:24 »
Quote
Thanks for the advice all  :y

Update !  did some more work this weekend, flushed and bled brake system, changed drop links, rotated tyres, and found a split in a vac hose which had been taped up previously,

Retaped hose as temp measure, and seems a little better, but may be wishful thinking

BUT.... noticed a coolant leak from passenger side of engine, down on the block somewhere   ::)
didnt have time to locate properly, but HBV seems a good guess from posts on here !  Is it located here ?

And...  very strange knocking from top end somewhere during warm up. Its ok when cold, gets very noisy when engine around 20 - 40 degrees , then fades to almost nothing when up to temp !

Sounds too Heavy to be tappets, and cam bearings would be noisy all th time I think ? Any ideas welcome ....  this is turning into a nightmare !

Oh, and have ordered a crank sensor just in case   :D

HBV is located at the back of the engine looking from the front of the car. It is actually under the black windscreen scuttle (bit where the wiper arms come out of).

Your "engine block" leak might be a core plug. If the car hasn't had antifreeze in they can fail. Have you got a stain down to and below the oil filter on the side of the engine?

Another problem area on the vacuum system is the vacuum tank. That is located low down on the left of side of the rad when standing at front of car. I have a similar gutless problem with my car and as yet have failed to find the prob though I too have found split pipes (at rear of plenum). As ever the advice is to be methodical and test rather than just keep buying new parts in the hope of fixing.   
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Andy B

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Re: 2.5 V6 power and torque (lack of)
« Reply #21 on: 22 February 2010, 09:46:00 »
Quote
....
HBV is located at the back of the engine looking from the front of the car. It is actually under the black windscreen scuttle (bit where the wiper arms come out of).

HBV is at the back of the driver's side of the block. :y




Quote
....
HBV is located at the Another problem area on the vacuum system is the vacuum tank. That is located low down on the left of side of the rad when standing at front of car.  .... 

A car of your age should have 2 vacuum reservoirs. One where you say, by the rad, the other should be next to your pollen filter  ;)
« Last Edit: 22 February 2010, 09:46:12 by Andy_B »
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Varche

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Re: 2.5 V6 power and torque (lack of)
« Reply #22 on: 22 February 2010, 12:06:14 »
Quote
Quote
....
HBV is located at the back of the engine looking from the front of the car. It is actually under the black windscreen scuttle (bit where the wiper arms come out of).

HBV is at the back of the driver's side of the block. :y




Quote
....
HBV is located at the Another problem area on the vacuum system is the vacuum tank. That is located low down on the left of side of the rad when standing at front of car.  .... 

A car of your age should have 2 vacuum reservoirs. One where you say, by the rad, the other should be next to your pollen filter  ;)

If my late 97 car (which is a "98 mini facelift") has a second reservoir I have never seen it. Is it under the scuttle next to the pollen filter or in the engine bay next to the pollen filter?
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Andy B

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Re: 2.5 V6 power and torque (lack of)
« Reply #23 on: 22 February 2010, 12:12:07 »
Quote
Quote
Quote
....
HBV is located at the back of the engine looking from the front of the car. It is actually under the black windscreen scuttle (bit where the wiper arms come out of).

HBV is at the back of the driver's side of the block. :y




Quote
....
HBV is located at the Another problem area on the vacuum system is the vacuum tank. That is located low down on the left of side of the rad when standing at front of car.  .... 

A car of your age should have 2 vacuum reservoirs. One where you say, by the rad, the other should be next to your pollen filter  ;)

If my late 97 car (which is a "98 mini facelift") has a second reservoir I have never seen it. Is it under the scuttle next to the pollen filter or in the engine bay next to the pollen filter?

under the scuttle next to the pollen filter  :y
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mtbskills

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Re: 2.5 V6 power and torque (lack of)
« Reply #24 on: 22 February 2010, 13:18:20 »
doesnt seem like the hbv then

i dont know for sure if the leak is from the block itself, could be a hose or joint down there somewhere.

any ideas on the 'orrible noise ? or should i post another thread for that one ?
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mtbskills

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Re: 2.5 V6 power and torque (lack of)
« Reply #25 on: 22 February 2010, 13:25:34 »
Quote
Firstly, 31 can be ignored IF the car starts.  If the crank sensor is dead enough to cause a 31, it will never, ever start.

Obviously, and diesel will feel more torquey than any petrol, thats the nature of the beast.
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but you would expect a 2.5 v6  to pull reasonably well from low down ? all my previous petrols have been 4 pots, so not got much to compare with really
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