Totally frustrated!

[MalteseMarc]

Don't get me wrong I really like my R75, certainly been the best overall car that I have owned by a long way, BUT...it has taken me a long time and considerable amount of money in acheiving the ultimate driving experience, some of the many mods/upgrades I have completed are as follows, EGR bypass valve, PCV filter(fit & forget), Synergy 2 with pierburg maf, engine remap, powerflow stainless steel cat back exhaust, mk2 air intake mod, these are just a few of the important ones I have done in an effort to improve the efficiency, performance and equally important to improve the fuel consumption, anyway the reason I mention all this is that the car has developed a problem which I think is recent, and with the above mentioned items replaced/upgraded may rule out some obvious areas. Right on with the problem, upon hard or even moderate acceleration the car spews out a load of black smoke, I'm not talking about a little puff but quite a considerable amount which leads me onto thinking it might be a fuelling problem, possibly? so what like to get your expert views on the matter, because the only thing that hasn't been looked at is the injectors, and what with the MOT due very soon I'm worried it may not pass So maybe someone can point me in the right direction as to what the possible problem could be.

[Mintee]

I'd try a generous shot of 2T oil (500ml in a full tank) and take the car for a damn good thrash before you get too carried away with diagnosing even more problems!

[Brigus]

You may have answered your own question - injectors. Black smoke usually means too much fuel is being chucked into the mix. There are other explanations (more tech-adept folk will no doubt be along shortly) but injectors are a good starting point to check. These are of course normal wear items so need replacing on any car sooner or later.

[Mintee]

Originally Posted by Mintee

I'd try a generous shot of 2T oil (500ml in a full tank) and take the car for a damn good thrash before you get too carried away with diagnosing even more problems!

Actually I'll add to that....

• Add the 2T oil to the fuel.
• Get the engine hot. If your thermostat is okay the needle should be around the middle of the temp gauge. (If not you need to sort that too!)
• Drive another 20 miles to make sure the engine is hot all over.
• Then find a clear open road and rev it past 4000rpm (in second or third is fine) for 5 to 10 seconds, repeat several times.
• Keep doing this until you just see just a fine grey haze.

If you glance in the mirrors the first few times you might think the engine has exploded but you should find that after a half-dozen or so attempts there is far less black smoke.

[BigRuss]

First( if you haven't done them already) to check is the intercooler elbow oil seals, or loose or damaged intercooler hoses or rarely a hole in the intercooler, problems that cause the symptoms you describe.

New Vitron ones that don't swell are available from Jules.

A good dose of injector cleaner can do wonders 1/2 a bottle in a tank wil normally do it.

If those don't work further investigation may be required, note that the Synergy will exaggerate any injector problems.

Other possible causes are overfuelling Maf or injector problem.


Russ

[AURORA MG]

Originally Posted by marc.t1

Upon hard or even moderate acceleration the car spews out a load of black smoke, I'm not talking about a little puff but quite a considerable amount which leads me onto thinking it might be a fuelling problem, possibly? so what like to get your expert views on the matter, because the only thing that hasn't been looked at is the injectors, and what with the MOT due very soon I'm worried it may not pass So maybe someone can point me in the right direction as to what the possible problem could be.

As you are not too far from us it may be worth calling & speaking to Ralph to see what he sugests & if it is an issue that you can't do yourself then hopefully we can assist.
01634 388999
www.mgr-service.com

[FROGGY]

Lots of black smoke is too much fuel/too little air, both of which can be linked together in certain places.
Some good suggestions above, which I won't repeat because it annoys some people

Mick

[Mintee]

Originally Posted by FROGGY

Lots of black smoke is too much fuel/too little air, both of which can be linked together in certain places.

This is a good point.

marc.t1 you could try turning the Synergy to the lowest setting (or even run with the 'tuning' switched off) and see if there is any difference to the production of smoke.

[philjudo]

Might be the synergy setting, try turning it down to maybe a 4 or even disconnect it then try it, but it certainly sounds like overfueling but that would rule out the synergy.

[MalteseMarc]

Originally Posted by Mintee

This is a good point.

marc.t1 you could try turning the Synergy to the lowest setting (or even run with the 'tuning' switched off) and see if there is any difference to the production of smoke.

Thanks for all your suggestions guys, just replying to the above mentioned points, I have actually been running for the last day with the synergy turned off, but the mafam switched on to see if that made any difference, which it has slightly, so I will be doing what has also been recommended with the injector cleaner and give the car a good run to see if that will improve it, otherwise it will have to be professionally looked at and i'm sure that will be yet more £££