Poor MPG

Level 7 User Joined: 12 Mar 2005 Posts: 243

Right done my CTS, as stated this is VERY easy. All your going to need is a wrench and a 21mm deep socket. Take the inlet pipe off and remove the pipe between the ICV and inlet manifold as it makes access much easier.

The CTS is as u can see the white one, connector is off.
[img:1024:768:17b0675d49]http://usera.imagecave.com/Peahol3/Progress/08070001.JPG[/img:17b0675d49]

Yours will be like mine and be a royal pain in the ass to get off, get some WD40 down there and be quick with a the replacement so u dont get coolant everywhere.

Manky old CTS
[img:1024:768:17b0675d49]http://usera.imagecave.com/Peahol3/Progress/08070003.JPG[/img:17b0675d49]

As for MPG, best ive seen on the trip was 56mpg driving like a grandad and before things went wrong I was getting about 420 miles to a tank.

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

ad thats the ph1 early ph2 style head. The later one the CTS is on the stat housing.

Level 6 User Joined: 16 Dec 2005 Posts: 145

So the CTS has fixed everything then??

I might change mine, i drove like a god yesterday and managed about 260 miles to 2/3rd of a tank i didnt put me foot down once and still that only works out at 35mpg.

Will get mine changed i think.

Level 7 User Joined: 12 Mar 2005 Posts: 243

Things are looking better, had the average upto 43mpg on the way to work and with abit more spirited driving 37 on the way home.

Level 9 User Joined: 03 Jul 2006 Posts: 412

went on a long run this weekend, it was doing 29mpg this morning but 35mpg on the way back (at 85mph). wonder whether it prefers cooler evening air or something. weird. oh, and changing the CTS didn't help one bit Sad

Level 7 User Joined: 11 Aug 2006 Posts: 206

looks same as my head, think i should change it then? whats the brown 1?

Level 3 User Joined: 14 Aug 2006 Posts: 64

Think it's the temp sensor dor the dash

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

What Jorge said.

Level 8 User Joined: 30 Jan 2006 Posts: 270

didnt Chris H also say something about the plugs being pants and to change them to single electrode

Level 9 User Joined: 03 Jul 2006 Posts: 412

regarding CTS, you could test it. haynes gives the specified resistance when hot or cold for the sensor. So plug in a multimeter on the Ohms setting and look for the resistance across the sensor terminals. iirc it should give about 200 ohms at 20 degrees and more like 2000 ohms at 80 degrees. or the other way round Very Happy

Level 7 User Joined: 12 Mar 2005 Posts: 243

jimr19";p="108048 wrote:

looks same as my head, think i should change it then? whats the brown 1?

Cant do any harm, but from reading your post over on RSC about only pulling 4000rpm in 5th at 100 your not going to see much improvement till you sort the box. I see 75 at 3500rpm in 5th.

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

lol can't do any harm but it won't do any good will it, his temp gauge is fine.

checking the resistance is pretty pointless, unless you have a scop and have its frame nice and small to catch any drops which ti will have.

Retroholic Joined: 27 Feb 2006 Posts: 1000

really intresting thread this, picked up on the engine differences from ph1 and ph2, and as i have had a replaced engine about 3-4 years ago, i will have to check what type it is, unless you can tell from my pics chris?

Level 7 User Joined: 11 Aug 2006 Posts: 206

mm i wil return when the box is sorted Wink

Level 7 User Joined: 11 Aug 2006 Posts: 206

box aint sorted yet but my 4th gear is the same as 5th should be lol doing 75 at 3.5k so using this to check my performance it should pull quite easily in my 4th gear upto top speed from 100mph right?? anyways it dont lol, has any1 actually sorted the poor mpg question yet?, i also spotted that my head is different to them pics the sensors are in another thing on the side of the head Smile

mmm nobody knows lol

Mr Quoter-vator Joined: 16 Feb 2004 Posts: 7405

later style stat housing Jim...no difference in the sensor tho, just unscrew it and swap it...easy to get to as well.

Level 7 User Joined: 11 Aug 2006 Posts: 206

ok cool, thanks, il try 1 of them, they got them quite cheap on bb tunings site, its the white plug i want right?

Mr Quoter-vator Joined: 16 Feb 2004 Posts: 7405

You call Â£17 from BB cheap?!?

Go to your local motor factors and get the same one for about 7 or 8 quid mate. Don't use BB for anything!

Whereabouts in Wales are you?

Level 7 User Joined: 11 Aug 2006 Posts: 206

im in welshpool, didnt think u could get sensors from parts shop Smile

Level 7 User Joined: 12 Mar 2005 Posts: 243

Get it online from GSF.

Level 1 User Joined: 05 Oct 2006 Posts: 30

This might not be the problem, but just check it anyway. I noticed on mine that it wasn't doing appropriate mpg, and could also smell petrol. I checked underneath and the rubber pipe at the back of the tank was leaking. Since I fixed that it's been better. Just a thought as most are over 10 years old!