Slow 16v?

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

gradient springs to mind ben.....slower one way and faster the other Idea

Site Subscriber Joined: 10 Jun 2004 Posts: 2317

Bah, mine's slow permentantly, that 115 was coming downhill off the m62 summit!

Site Subscriber Joined: 07 Oct 2004 Posts: 2281

Mmmm admittedly the M67 is gradiented slightly but not enough to cause such a decay in speed on the way out?

Sometimes it even feels dangerous, not being able to speed up when required!

Site Subscriber Joined: 10 Jun 2004 Posts: 2317

JB suggested a few things that might be the cause, namely:

Blocked cat
Dirty injectors
Faulty ECU
Dodgy Fuel pump

Now, Although the most plausable, I can't see it being a blocked CAT as its just had its MOT and if blocked would have failed emmisions? As for the rest, I dont know... like a needle in a hay stick

Gonna change the fuel filter and see if that helps.

Site Subscriber Joined: 07 Oct 2004 Posts: 2281

I suppose a faulty ECU could potentially give rise to a weak air/fuel mixture hence the lack of performance, but is it just top end that's suffering or is it slow all through the rev range?

Site Subscriber Joined: 10 Jun 2004 Posts: 2317

Everything, top end and through the gears. Addie and Liam (who bought my old one) said the difference was noticable after driving mine for a week then getting in to me old blue one

Forum Moderator Joined: 18 Feb 2004 Posts: 7432

i have a theory about mine. I think the exhaust boxes are full of crap/blocked, possibly with bits of the cat.

The last thing i did to the car before it went all shit was weld up a huge hole in the exhaust, where the middle branch off box was hanging off. That would have been the only free-ish escape route for the exhaust gasses if the back box is full of crap.

I did shake the back box about when i had it off, and could hear a load of stuff rattling about in there, but i couldnt get it to drop out so i thought sod it and put it back on anyway.

before:

after:

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

why would a blocked cat affect the emmisions at mot time?

it wouldn't.

faulty ECU is doubtfull as I have never experienced one ever that snot either been water logged or left connected alogn with the alt and battery durign extensive welding.

Site Subscriber Joined: 10 Jun 2004 Posts: 2317

Just thought a duff cat might have effected emmisions, seeing as thats what their there for, I dont know Razz

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

a blocked cat won't do much to the emmisions really, well it will affect them but normally not enough to fail.

Forum Moderator Joined: 18 Feb 2004 Posts: 7432

Right it seems my theory about mine was correct.

I put the magnex exhaust off the hatchback on it (yes, the whole thing, from the (de)cat back) and guess what...

flawless. Revs freely, and is nice and fast, just like the hatchback is (was). Doesnt look too bad either, although it will obviously shag the paint on the bumper above it over time. I cleaned up the oil in the engine bay before my test run as well and no more has appeared. I guess it was the dissy after all but it was just taking its time to burn off all the oil. The underside of the car is coated though!

Now I just need to either:

1) find a chamade stainless exhaust and put this one back on the hatch

2) try and get the crap out of the chamade backbox and put it back on, then this one back on the hatch

3) try and get the crap out of the chamade backbox, hacksaw the end off it and put it on the hatch

decisions decisions!

Also the clutch slips like a bitch pulling away, no more than a couple of thousand miles left in it. The pedal is twice as heavy as the hatch's though so perhaps some investigation of the pedal/cable tomorrow will reveal a previous owner's bodging to be the cause. Well, a man can dream!

Forum Moderator Joined: 18 Feb 2004 Posts: 7432

Well, there was a brand new scorpion stainless exhaust on ebay that ended this evening. Went for Â£150. I did consider bidding on it, but decided not to as i have vowed never ever to own another scorpion exhaust as long as i live.

JB now has the one i had on my hatchback. He thinks i was exaggerating the frustration and annoyance the hangers on that bastard thing caused me. He will find out for himself soon enough when he comes to fit it. Twisted Evil

Site Subscriber Joined: 10 Jun 2004 Posts: 2317

Interesting ....how if its a similar thing with mine...

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

oil pissing out from the dizzy will have coated the clutch, a few hard starts will clear it as long as the circlip disnae pop.

I have just banged th ecat out on the laguna today! I will put pics up in the prog report for it.

Forum Moderator Joined: 18 Feb 2004 Posts: 7432

ok well ive been playing about with the car. Couldn't believe all that oil came from where the dissy was sitting a bit proud of the head.

So i whipped a few bits off, was going to nip up the cam carrier bolts and rocker cover bolts. But upon removing the lifting eye/throttle cable mount, this is what i saw:

Hmmm, That doesnt look right Neal. Is that...no, it cant be. Is that the end of the camshaft i can see?

Why yes, yes it is.

Thats not right is it? Surely I shouldnt be able to see the end of the camshaft from outside the engine?

No you shouldnt, youre absolutely right.

So why can I then?

Well...it appears that whoever did the recent head gasket change before I came into ownership of the car was a bit of a muppet. a couple of nuts missing from the inlet manifold flange, dissy not bolted to the head and it also seems they felt it wasnt necessary to put back the core plug that Renault so thoughtfully included in their design in their lunatic obsession with actually keeping the oil inside the engine. Rolling Eyes

Should look like this, as shown on my spare engine:

So now I need to either get another one of those plugs from somewhere, or borrow it off my spare engine, and all should be well.

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

77 03 075 143 PLUG 2.80 ---3 x 1

Forum Moderator Joined: 18 Feb 2004 Posts: 7432

nice one!

Dealers is shut now Sad

oh well, ill use loads of instant gasket and bolt the lifting eye back on for now, dont really want to pinch bits off the other engine, i know where that road leads...

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

instant gasket, I assume a bit of frosties packet went on first?

Site Subscriber Joined: 10 Jun 2004 Posts: 2317

77 03 075 143 PLUG 2.84

I think is the part you need

edit, oops, chris got in there first!

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

haha your to slow Razz

Forum Moderator Joined: 18 Feb 2004 Posts: 7432

You have to get up pretty early in the morning to beat Chris 'fast fingers' H on dialogys part matching. In fact, you have to stay up all night Very Happy