I picked up some replacement fuel injectors for my '89 328. So now I need to get the old ones out & replace them. As far as I can see from searching around the injector has a doughnut shaped seal round it that fits into a plastic (or rubber) mounting thing that's set down in the inlet manifold with a circlip on top holding it in. It would seem to make sense to replace both of the rubber parts as well - so I need to get the mounting thing out without dropping bits & crap down into the manifold. From what I can read the injectors should just pull out (with some effort!) So anyone have a view as to what's the best way to do this? One option would seem to be to just pull the whole manifold/plenum off & do it on the bench
head over to the 308/328 forum and do a search. verrell makes a nifty extractor that will do the job for you.
Thanks, I've seen it - I'm not sure if it willl work on a 328 - the injector mounting system is a bit different.
it's actually plain simple, just pull them out, there usually not very tight, and replace the o-ring. Put a little oil on them and push the back, i left the plastc holder untouched, however i did inspect one but there nothing to wear in it
Thanks Steven - is the holder plastic or rubber? If it is rubber I was more thinking about it degrading/cracking etc.
plastic, you could chech it for age as i did, but in my case they were oke ( car ran 15000 miles so far)
Ifs they are like my 308QV I just found the correct nut to thread onto the injectors. I then put a slipped a closed end wrench down past the nut, turned it slightly, and then levered up on the nut (cant remember what against). The injectors just pop out. To put the new ones in I put the nut onto the new injector for something to push down against. I might have even tapped lightly on it to get it in there. It was a very simple procedure. Make sure you dont have leaks after you start it up!! Aaron
Several hundred replaced injectors...just in 328 alone. The snap ring does not have to be removed! Break the injector/lines free using a 12mm wrench/14mm flare wrench Using the "VW-Audi" generic injector pulling tool (about $7 USD....and been in production about 25 years), simply pry the injector up. Usually the seal comes out with the injector...otherwise just lift them out with a pick tool. Lube the seals and slide them on the injectors...A little more lube on the seal, and press them into the holders with thumb pressure. Reconnect the lines....and you're done. This would be a good time to check the ARF with a 5-gas analyzer. David
to add, disconnecting the injectors is nessecary when using his tool. just usi an ope spnner just below the upper nut and you flip the out laving the fuelline connected.
You're welcome! I use a silicone-type spray on the injector seal to slide it on the injector. Then, I apply a light coating of gear oil/assembly lube on the injector seal, prior to pressing them in. Too much lube here...and the injector will want to "pop out".
Yep...although you'll pry under the tool, versus using the slots machined into the tool. I use a large screwdriver and some wood wedges and pry up against the bottom of the tool. David
The actual injectors are a common Bosch part # 0437502047. The same part fits 308s, 328s & Testarossa's etc plus a load of Mercs & I think some VWs with Bosch CIS K Jet injection . Just do a web search for that part number & you will find them. Pretty easy to get hold of but wildly varying prices. As injectors go (in comparison to those for some other cars) they are actually fairly inexpensive (which makes a nice change!). You should be able to source them for under $25 each (possibly under $20). You will find some jokers asking over $100 each for them. I still need to source the seals (the part number is around on FChat in one of the threads - do a search for the injector part number & you'll probably find it.)
Thanks found some on Ebay but want to source the seals as well. My next question really is for the cost of the injectors and given the car is 22 yrs old but with 19000miles,should I replace them just for a preventetive issue?The car runs fine but how would I know that it could be running better?
That's where I am at - only at 37K miles. At 19K I probably wouldn't do it to be honest - I'd pour in some injector cleaner once every 12 months or so & keep going for a while yet. Annecdotally it seems to be that they can start to cause issues from about 40K onwards (although some never do obviously - no doubt there are 80 & 100K mile cars out there on their original injectors.) I am therefore just being pre-emptive. However, I would expect the degradation to be gradual. When I have replaced mine (the injectors arrived this morning) I'll come back & let you know if I can detect any performance impovement. I'm not expecting much if anything to be honest - but who knows! As I said, I will let you know my "butt-dyno" reading when the job is done. I am just on a gradual program of renewal - each year I change a few more things over. If you havn't already done it I would suggest you concentrate on things like rubber fuel lines, the flexible brake lines & maybe some coolant hoses & air/vaccum lines as a priority. I.
Dumb question: What's ARF? Dumb suggestion: What about just pulling them out and cleaning them via Birdman's documented procedure?
That what I thought at first, too. But hey, you never know. Maybe I was gonna learn something new today.
