Fed up with smelling of exhaust fumes!

[Guest]

Whenever I drive the old '44 with the windows open, I end up stinking of exhaust fumes- I know it's not the boot seal, cos when the windows are closed, it doesn't happen.....

Is this a common problem ( I can't imagine it is)?

Also, is there anyone in the Coventry area who can take a look at my mixture levels -it's running uber rich, you can smell that it is, but also, the tailpipe is very black!

cheers!

 

[wblackw9]

What oil do you use? Sometimes a sinpmle oil change with a good quality oil can make a difference, cheap oil smells when its burnt. I found on my 44 when i done an oil change with mobil one it was much better? Also if its running rich then this could be the likely culprit!

 

[wibble]

Sounds like you may have a leak in your exhaust system - is it a standard system? You should not get fumes from the side windows, but if your rear window was slightly open you may get fumes drawn back through the car.

 

[knightma]

Sounds to me like the rear hatch is not sealing correctly. This could be due to the rubber seal or the mechanism being faulty or incorrectly adjusted. When the side window is down, the pressure inside the car will reduce increasing the likelihood of drawing in exhaust gases from the rear of the car.

 

[xenon]

In Coventry use PCT cars on the A45 - attached to Autobahn Porsche. Good rates and expert service - they only deal with Porsche.

 

[edh]

ORIGINAL: knightma

Sounds to me like the rear hatch is not sealing correctly. This could be due to the rubber seal or the mechanism being faulty or incorrectly adjusted. When the side window is down, the pressure inside the car will reduce increasing the likelihood of drawing in exhaust gases from the rear of the car.

Absolutely right - opening the sunroof also has the same effect. Most likely the hatch seal or rear light cluster seals. It's a very common 44 (and 24) problem

Try playing a hose over the rear lights & see if you get any water in
Try some vaseline on the hatch seal & try & adjust the hatch pins.

 

[peanut]

ORIGINAL: knightma

Sounds to me like the rear hatch is not sealing correctly. This could be due to the rubber seal or the mechanism being faulty or incorrectly adjusted. When the side window is down, the pressure inside the car will reduce increasing the likelihood of drawing in exhaust gases from the rear of the car.

spot on!
Air rushing past the open window or sunroof sucks air out of the car creating a huge vacumn in the cabin .In order to equalise pressure air is sucked in from anywhere in the cabin to replace lost air . ie rear hatch seals ,door seals, rear light joints etc.
Had the same thing many times on various hatch coupe's (240z etc) I would recommend removing the rear lights completly and putting them back with some silicon mastic around the flange to rear valance joint. Make sure everything is clean and dry first though .This should ensure you get no more water into the boot area too hopefully.

Smear some vasoline on the seal face as edh suggested and then shut and reopen the hatch. You should be able to see which parts of the seal , if any, are not sealing properly. My bet is on the rear lights though

 

[Guest]

Thanks guys! I had a problem with a broken hatch catch a while ago, and the car was constantly full of fumes-when I replaced it, the problem was reduced- ill try the vaseline trick and look at the tailight seals...

 

[Guest]

Aha! just been outside and grabbed the hose.....water is pouring through the NSR tailight (the one over the tailpipe.....hmm!), and the hatch seal is wet, but the seal around the body is dry...think we may have found the culprits!

Still need to sort the mixture out though...the soot on the tailpipe is unbelievable!

Thanks everyone!

 

[peanut]

excellent Dick should be fantastic difference when you're all sealed up. Fen or someone should be along to advise you on the over rich mixture . What year is your 44 ?

 

[Guest]

She's a square dash 85

 

[Fen]

Me? Not sure about rich running Luxes to be honest as leaks on NA cars cause lean running if anything.

Worn injectors I guess but I don't know how common that is. My BMW ran rich when it needed injectors but it was diesel which is a whole different pan of hallibut.

I guess if the AFM reads high then the ECU would be told there is more air than there actually is coming in.

A dodgy temp sensor that has the car on the warm-up mixture all the time would do it also.

 

[peanut]

well I know next to nothing about the fuel injection system but from what I have read I should say the most likely culpret would be one of the injectors are not operating properly . You could try running at idle and then one by one unplugging the electrical connector to each injector. If one doesn't cause an equal change to the engine speed of the others you've found your offending injector.
You can test them with a multimeter. Should be 2-3 ohms across the terminals


Or.....the Engine temperature sensor . When your engine recently overheated it could have cooked your engine temperature sensor which is now misreading

The result of this would be that the DEE would allow more fuel to flow through the injectors to cope with the `lean' mixure it believes the engine is getting. ?
or it might be the Fuel Pressure Regulator.which regulates the fuel pressure in the fuel rail by passing exxcess fuel back to the tank ?

 

[Guest]

Could it be related to the little idling issue i've been having? sometimes the car will only idle at 600 rpm, although sometimes it idles at 1100rpm...."normal" idling seems to be 1000 rpm...

 

[dlknight]

ORIGINAL: knightma

Sounds to me like the rear hatch is not sealing correctly. This could be due to the rubber seal or the mechanism being faulty or incorrectly adjusted. When the side window is down, the pressure inside the car will reduce increasing the likelihood of drawing in exhaust gases from the rear of the car.

I used to have this in my 944S until I bought new hatch pins and adjusted them properly so the hatch closed nice and snugly against the seal.

Dave K.

 

[peanut]

ORIGINAL: dick dasterdley

Could it be related to the little idling issue i've been having? sometimes the car will only idle at 600 rpm, although sometimes it idles at 1100rpm...."normal" idling seems to be 1000 rpm...

yes it could be . I had this myself on the 86 lux . it turned out to be the throttle switch or the air flow sensor.The other distinct possibility is an air leak somewhere on your vacumn system. Run a bit of soapy water around all the joints whilst its idling and see if you spot any leaks.
I think its more likely that you rich mixture has sooted up the idle sensor though . I think you might have two related issues here .

Would recommend you start a new thread for this isue Dick as its getting buried in this thread. Hopefully you'll get a better response.