Delica Canada | Mitsubishi Van Club

Over the last couple of days I did belts/timing/fuel filter/air filter/water pump/valve adj... it took me around 8hrs in the driveway, with breaks, and I'm pretty sure I spent a good deal of time removing the power steering bracket when I probably didn't need to.

The last thing I'm trying to measure/check is for a possible exhaust restriction. I attempted to use the vacuum measurement technique by connecting my boost/vacuum gauge to the EGR vacuum line. But I get nothing at idle or mid revs (~1500-2000)... I'm guessing the diesel vacuum system is significantly different than on a gas engine. Is there a way to use vacuum to check for exhaust restriction? Or is my vacuum pump dead?

Diesels don't make engine vacuum since they have no throttle. The vacuum that runs the EGR, brake booster, and aircon idle-up comes from a vacuum pump on the back of the alternator- that's the bit that has the oil return pipe going into the sump.

My favourite way to test exhaust restriction is to remove the exhaust system and replace it with a 2.5" side exit exhaust.

I'm considering a 2 "straight pipe" type of system; I understand that these things aren't very loud unmuffled. I should probably test that first...

I had a 2' straight through system for a while and it was too loud for me. Cops pulled me over and gave me a defect notice for excessive noise along with a couple of other things. I got a resonator put on which did quieten it down a little but it is still quite loud if you floor it. Next time I would put a larger muffler on if I do it again.

Thanks Gezza!

We've checked on the mufflers for delica with my dad, as his blew due to a piece of rust or metal that blocked the outlet. He wanted a muffler that would sound as close as possible to the one he had, so we checked online and found a nice aftermarket one (https://www.carid.com/exhaust-mufflers/). I must admit, the sound is close, yet a little louder. But he liked the way it was installed and now is totally happy with what he got.