Misfiring diesel

[newguy]

I have a '93' 106 1390cc diesel that misfires when at a constant speed, when warm, at any speed. I also have a '93' non-turbo 405 diesel that has started doing the same.
Does anyone know what would cause this to happen?
My local peugeot dealer checked the 106, but said that there was nothing that they could find, but still replaced the air filter.
Any help would be appreciated.

[504gld]

Hi welcome to Club Peugeot UK forum. The 106 has the TUD diesel engine, and in the case of the 1993 model the TUD3 of 1360cc indirect injection. The symptons you describe sound very much like air is making its way in to the fuel supply. Diesel engines require a constant flow of fuel free from any air in the pipes. I would firstly start with changing the fuel filter, its quite easy on this 106. Remove the battery to gain access to the filter, unscrew it as its a canister type, but be carefull as it will be full of diesel. You may need to use a filter wrench. Replace it with a new one, and prime the system. This is done by using the squeezy ball, pump it until you feel resistance, then continue for several more pumps. Operate the glow plugs, and crank the engine with the accellerator to the floor. The engine should start, but keep it revving until the lumpyness goes away and the engine can idle. Diesel filters on 106 should be done every 15000 miles.

If you have no joy and the problem persisits you need to check every fuel pipe from the fuel pump on the engine, through to the filter for air leaks. Replacing the pipe from the filter to pump with fuel grade clear pipe can help you see if there is air getting in. This may however be difficult as the 106 used very small preformed tubes, new ones may be the only option. If you dealer doesnt carry them try Dean www.peugeotparts.co.uk who can send them 1st class for next day.

Finally a good old Italian decoke on these engines works wonders, I used it to great effect on my old 93 106D I had. 2nd gear is ideal, slowly let the revs build until the the governer kicks in, let the revs drop off, then on, off, on several times, the smoke will clear out - mine even after 150k hardly managed a reading on the smoke meter at each MOT. (of course just be sure of your cambelt status and overall engine health if you consider doing this!!!!!)

[newguy]

Thank you Modgod for your advice. It seems to be the most sensible information I have been given.

[regfru]

i had similar problems to you with my 106 and after replacing fuel pipes and jubilee clips (to make sure air wasn't getting past them)it was no different, i then managed to by pass the fuel filter and proved that air was getting in through the filter,unfortunately it wasnt that easy after replacing the filter twice i finally found the problem.....the filter housing had become porous!!!i was lucky to get one from ebay £25 otherwise £145 from peugeot,hope its only a pipe good luck