Cleaned my injectors
 

Today I took the fuel rail apart and removed the injectors, and with spray carb cleaner, cleaned them up. I sort of carefully sprayed off the nozzle end (not touching tip) and filled upp th injector with cleaner before re-assembling. I sprayed a bunch of carb cleaner down the unjector holes as there was a lot of gunk down in there, as well.I guess the Injectors were full of cleaner for about 10 mins while I put it all back together. After a second or two of cranking, the car lept to life and now runs substantially beter than before. Starts easier, crisper throttle response and more (seat of the pants) power. gotta love it! I dont know if in the 160,000 miles on the car they had ever been out. they were pretty cruddy.
Brian

I am going to send mine to RC racing within the next 2 weeks. I'll let you know how it goes.

Brian,

Did you have any trouble getting the injectors in or out? I hear some stories about O rings and the like.... Was it a tough job? I plan on taking a look at mine this weekend.

not much problem getting them out, just kinda wiggled them while prying up on the rail with a screwdriver. Re-lubed the o-rings with ATF to reinstall.\
Brian

Could you please post a brief procedure? I want to do it too. How long did it take you to get it out and back in?

Thanks
Eugene

Its not too hard to do. I followed the general directions on http://porsche-944-garage.tripod.com/ .
look in the 944 garage/ shop manual and scroll down to fuel rail removal. After removing the rail, you can remove each injector from it my removing the clips and pulling them out. The only things to be careful of are:
1. dont touch the injector tip. it is very fragile and if you mess it up, the injector is toast. I just sprayed them off with carb cleaner.
2. Lube the o-rings well before you try to put it all back together. Use ATF. (its in your power steering resivoir)
3. Keep everything really clean. If you get anything in the injector, it will clog for sure.
Good luck!
Brian

oh, and it took about 30-45 minutes to do it all.

Thanks. I will give it a try since it only takes less than 1 hr.

Buy new O-rings before you take it apart, the old ones might be destroyed during removal. On my '83 they didn't look very good after 18 years.

/Magnus

I replaced the O rings on my 951 injectors a few weeks back. The kit I bought only had O rings, but I've seen other posts where folks also got the little plastic hats that go on the end of the injector.

Two of mine cracked and had some small pieces break away. I didn't realize at the time they are replaceable so just kept what was left on the end.

The car runs perfectly fine still, so what's the purpose of those hats anyway? What happens if they're broken or removed?

Th little hats help with spray pattern and are needed. after so many years in the hot cold enviorment of the engine they become brittle and break when you try to remove them to clean. I do not have a good source for the injectors caps.

Kevin
PCM Injection

I went to Pep Boys, they should have a part kit for the bosch injection, It was made by BorgWarner. I will post part number tomorromw.....it was like 2.49 per injector, you get two O rings the plastic washer and a replacement hat.. The old ones are a ***** to get off, I just used a screw driver. To get the new ones on take a 10mm socket and gently push your palms together and they will snap on, there are two litte ridges that you have to click over.

We have a source for the 83-84 944 injectors stock $49.00 each. If anyone is interested. They are actually a upgrade. These are self cleaning disk type not pintle.

Kevin

Kevin, are the '85 and later injectors pintle type? If I had the disk type would I still have to clean them with Techron?

Mark
'86 944NA

I did the whole injector job on my 86 944 n/a. I did the cleaning with techron and other cleaners, but it didnt do that great a job, to really clean them great you have to open up the injector and spray cleaner through it. The local NAPA auto parts store did it for me, they have a machine that will actually show you the spray coming from the injector before and after cleaning, it was bout 10$ a injector and in my opinion very worth it!
Maciek

I am not sure about the 85 and later 944's. The reference I had only showed the injectors we sale for the 83-84. I am almost sure they are the same, if anyone knows for sure I would be interested in this info. As a matter of fact I am 98% sure Bosch does not make the disk type injector.

Any car with 100,000 miles needs the injectors cleaned or replaced to return the injector back to the correct spray pattern. Atomazation of the fuel is critical to the mixing of the air and fuel. The little hats are critical to this effect on your stock injectors. The disk type injectors are not clog proof by no means, but they are alot better IN MY OPINION than the pintle.

Kevin
PCM Injection

Maciek - I tried my local (utah) NAPA parts store here in Utah, but they didn't know (nearly) what I was talking about. Was it a NAPA parts store, or service center?

Kevin,
i was looking at you sites wasted spark ignition system. caould i adapt the fuel injector controller to it and have a complete EFI/Ignition system? looks like your kits, separately, are cheaper than the SDS or any other EFI/Ig system i've seen.
Thanks,
Eric

Eric:

Sorry they are not compatable. http://www.pelicanparts.com/ultimate/frown.gif

We are working on a complete stand alone system, that will be BOLT ON, to a 944 NA or Turbo. It will control fuel/ignition. It will be O2 feedback system, so it will tune itself, unlike 95% of the others on the market. It will have the ability to either run in open or closed loop modes. It has a 4 tower coil pack and its own amp, so the disty is history. It runs on a 1, 2, or 3 bar map sensor, so the MAF sensor is history as well.
The wiring harness is Plug and Play so Craig can even install it. (Craig I am from Alabama as well so I can talk about ya http://www.pelicanparts.com/ultimate/smile.gif) The system will retail for $1200 to $1800 not cheap by any means, but if you compare what you get for your money its the best deal on the market. BAR NONE!!

Kevin
PCM Injection

It was a machine shop inside a NAPA store, I thought everyone did the service, I guess not, try calling a machine shop in your area and ask if they do it, in my opinion VERY worth it.
Maciek

For the standalone system you are referring to - the closed loop operation worries me slightly. Although our Porsches do operate under mild loads and rpm at closed loop, they along with most other cars switch to open loop after the load/rpm threshold is exceeded.

I always thought that even a 4-wire O2 sensor was neither quick enough nor accurate enough for a computer to adjust fuel and timing from as it would have to in open loop mode (7000 rpm and 15 lbs boost for example).

For the system you propose wouldn't it cost about $400 just for the proper wide-band O2 sensor?

Erick

Maciek: I tried a service center, and they didn't have it, so I made a DIY cleaner, an cleaned them myself. See the recent post.
Also, what did the pattern look like when clean? Did you watch them do it, or only when they were done? My spray pattern was tighter than I expected...not much different than a water pistol, but some. About 2/3 the diameter of the injector cap, 4 or 5 inches out the injector, then staying focused.

Answers: to ?'s

It programs itself in closed loop mode to give you a a excellent base for fuel maps. A closed loop system for ignition can only be done with a knock sensor. Our system will NOT be closed loop for ignition, only fuel. We do not believe in knock sensors. A engine emits a certian frequency when it pings, getting the right frequecy for the right engine is millions in R&D.

Our system runs on a 4 wire sensor they do not have to cost that much.

We will reccommend it only to run in closed loop to program the engine base maps and then switch open loop to run all the time. You will still need to tweak the WOT maps to get max hp from your engine.

Kevin
PCM Injection

Hey kevin...what are the specs as far as performance figures go with the new system? increase in hp,torq etc-thansk-chriz

------------------
"Faster,Than,You"
"Wish I had a 951....."
"Ive tried so hard and got so far but in the end it doesnt even matter"
http://www.members.aol.com:/fty9999/944land/944land.htm

FTY:

We do not have any as of yet the ECU is being finalized with software of our own design.

Major advantages over the Moronic system are.

1. No MAF sensor to restrict the inlet air flow. Uses Map sensor instead.
2. Fully programmable so if you want to cruse on saturday night with 118 octane race fuel, looking for unepecting kills. you can design a program for that and take advantage of the added advance timing. When the fuel runs out download 93 octane program. or program your Porsche to run on 87.
3. Turbo guys can do away with the boost controller. Add 2 $5 dollar grainger valves with a solenoid valve and have Street/Race boost settings and programs that take adantage of both settings.
4. RPM limit set where you want it.
5. No speed goveners.
6. Wasted spark Ignition Has 2 coils instead of 1. At high RPM coils have more time to charge. Hotter spark.
7. Wasted spark fires one cylinder on compression stroke and its brother cylinder on the exhaust stroke. say CYL's 1-4 and 2-3 come up and down at the same time in the block. It burns excess fuel as it is leaving the combustion chamber. Better emmisions.
8. You can take full advantage of any mods you make to the car either by freeing up more air to or comming out of your engine.
9. Those are just a few!!

Kevin
PCM Injection