zullo

In the midst of a hose job on my '93 with 75000 miles on the motor... I replaced the pulsation damper. Should I have the injectors cleaned/checked while I'm in there? That is, if the car was running strong, is it worth the expense? The car is primarily a weekend / track car.

Any other maintenance items before I put it back together? I broke an oil line so they are already on the list, as well as check valves and pcv... solenoids seem to all check out, in that they operate, have the spec'd resistance, and are intact...

Mahjik

iTrader: (1)

IMO, yes. Since it's a pain to get to that stuff, you should do it while you are there if you don't know the last time they were cleaned and flow balanced. If for some reason one or both aren't flowing as they should, that could be a problem (i.e if the ECU thinks you are at 80% duty cycle, however you injectors are only flowing 70% of their max; you'll be sending less fuel than the ECU really thinks it is at that 80%).

zullo

Ok, I'm sending them to RCEng. Do I have any options for changing injector size (having them bored out) if I have a PFS PMC? I do not believe it can compensate for different injector sizes.

alberto_mg

you can have RC bore them out to 1200 or 1300cc. i recommend you search on 1300* b4 doing so as some people have experienced injector failure after having them bored out. i had an interesting conversation with the people at marren injector - www.injector.com about boring out injectors and he was nice enough to explain to me how it works and why they won't do it.

definitely worth cleaning them while you are in there though. also check/replace the fuel lines that are under there.

if your ECU doesn't have an option to change injector sizes, don't bother. unless you are putting out big HP numbers, you really don't need bigger injectors. there are a couple of threads on when you need bigger injectors.

zullo

Yeah, hopefully having them cleaned will improve flow somewhat. PMC is reporting 85% injector duty at high rpm so I was concerned.

DamonB

As someone who had an engine fire due to the short rubber hose between the primary and secondary fuel rails failing I highly recommend replacing that as well. It's cheap and easy to replace while in there.

dgeesaman

iTrader: (7)

My hose job:
http://web.newsguy.com/geesaman/Write-up.PDF

Dave

Mahjik

iTrader: (1)

From my understanding of the PFS unit, you can enlarge the injectors; however you have to keep the same ratio between the primary and secondaries. So you'd have to enlarge both for the PFS to work properly.

zullo

Nice writeup Dave, thanks! I all looks very familiar. Good idea on the ground straps; I hadn't thought to replace those.