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Author Topic: q's about the 2.5 v6  (Read 966 times)

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maddogboy

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q's about the 2.5 v6
« on: 11 January 2009, 08:27:38 »
morning! ive recently realised that i have some issues with the miggy, the eml has always been on, cant remember the codes, but its o2 sensor open. decided to have a good look yesterday and the gent who had it before me has fitted new o2 sensors, wrong ones that is! the cars m reg and the loom side is a 3 wire job, and hes cut the connectors off and put a pair of 4 wire sensors on........  could someone please tell me if which wires should be used for the sensors?  the other prob is when you rev the engine theres a whine, not at idle, just when revved on traveling in a low gear. cam belt? pullys? thanks for taking the time to read this!!

cheers
ian
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TheBoy

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Re: q's about the 2.5 v6
« Reply #1 on: 11 January 2009, 10:28:20 »
dont have haynes in front of me for wiring, not sure if facelift will be same.

whine - air leak? or something more sinister (you need to try to pinpoint it a bit better)
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maddogboy

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Re: q's about the 2.5 v6
« Reply #2 on: 11 January 2009, 16:31:07 »
should of said its a pre facelift, its on a 94 plate, the whine after looking a bit harder is coming from the left bank (as you look from the front). sounds like its from the topleft pulley. sorry i cant explain it better.

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Andy B

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Re: q's about the 2.5 v6
« Reply #3 on: 11 January 2009, 16:58:14 »
Quote
should of said its a pre facelift, its on a 94 plate, the whine after looking a bit harder is coming from the left bank (as you look from the front). sounds like its from the topleft pulley. sorry i cant explain it better.


Auxillary belt tensioner. Remove the belt, 15 mm spanner on said pulley centre nut and lever to your right as you look at it, slip belt off and run the engine briefly - the belt drives your water pump. If the noise disappears then you need a new tensioner roller which can be bought separately, despite what your dealer says  ;)
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maddogboy

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Re: q's about the 2.5 v6
« Reply #4 on: 13 January 2009, 17:52:20 »
sorry, not had time just yet to have a look at the tensioner, can the bearings be greased? i dont really fancy paying out for a new one as im not keeping the car much longer, anly until i can find a reasonable cav v6!
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ngrainqey

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Re: q's about the 2.5 v6
« Reply #5 on: 13 January 2009, 18:19:26 »
Quote
sorry, not had time just yet to have a look at the tensioner, can the bearings be greased? i dont really fancy paying out for a new one as im not keeping the car much longer, anly until i can find a reasonable cav v6!

yeah they sure can matey,if you undo the tensioner off the pulley as per normal right handed threads wth a 15 mm spanner/socket then just get either a paperclip thats straightened out/a very small flat headed screw drivers (the very very small sort) or some tweezers as demonstrated by TB i believe on the cam belt dvd :P (there's a small rubber seal on each side of the pulley between the centre shaft and the outer plastic)
HTH
« Last Edit: 13 January 2009, 18:20:19 by grainqey »
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shanjon

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Re: q's about the 2.5 v6
« Reply #6 on: 13 January 2009, 18:22:22 »
trying to grease the bearings may work, , the noise will only get worse until  the bearings seize and either totally destroy the pulley or will shred the belt i have seen both happen :y
« Last Edit: 13 January 2009, 18:23:46 by shanjon »
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maddogboy

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Re: q's about the 2.5 v6
« Reply #7 on: 13 January 2009, 18:48:07 »
thanks for the help, im finding the members here much more helpful that vxon! will strip it off tomorrow, should have some spare time hopefully! will let you know how i get on!
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ngrainqey

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Re: q's about the 2.5 v6
« Reply #8 on: 13 January 2009, 18:49:31 »
quite a few of us are on here out of preference over vxon- some of us are users/members of vxon also lol
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maddogboy

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Re: q's about the 2.5 v6
« Reply #9 on: 13 January 2009, 19:01:05 »
hehe, im a non paid member of vxon, soon to be paid member, they have always been really helpful with cavs when ive had them!
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ngrainqey

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Re: q's about the 2.5 v6
« Reply #10 on: 13 January 2009, 19:06:31 »
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hehe, im a non paid member of vxon, soon to be paid member, they have always been really helpful with cavs when ive had them!

and i'v found them absolutely useless with astra G/H's when i asked how you get the ash tray out lol!
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Marks DTM Calib

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Re: q's about the 2.5 v6
« Reply #11 on: 13 January 2009, 19:40:57 »
More often than not the 4 wire ones are not the right type!

Either way, all wires need to be connected.

Two of the wires will connect to 0V, the other will be for the heater and the last for the sensor.

What are the wire colours of the sensors?
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maddogboy

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Re: q's about the 2.5 v6
« Reply #12 on: 13 January 2009, 20:11:50 »
Quote
More often than not the 4 wire ones are not the right type!

Either way, all wires need to be connected.

Two of the wires will connect to 0V, the other will be for the heater and the last for the sensor.

What are the wire colours of the sensors?

lol, fair, unfortunately id not had chance to to work on the car befor the "other mate" had!!  no idea the colours, dont fancy crawling round in the rain!  rovers arent that bad, seen a few sri's off in a 820 sli!  will look at colours when im at work in the morning!
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Cliffo B

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Re: q's about the 2.5 v6
« Reply #13 on: 13 January 2009, 21:57:39 »
ecu pin 28 via screened wire brown blue trace to snsr   wire red blue trace to htr    repeat applies to other snsr from ecu pin 47   hope this info is ok I got it from Haynes early models wiring diagram best of luck :y
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