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edu Subject: Technical Hint - Bosch K-Jetronic To test injectors remove one from it's whole and cover the whole with a rubber stopper (chemistry labs are good sources). Stick the injector in a beaker (chemistry labs are good sources). If you find an injector not "pulling it's weight", don't commit it to the grave yard just yet. Put fuel line in beaker and push down (or pull up depending on engine) the air flow plate and hold, letting a few tablespoons of fuel run out. Turn injector upside down a shake it (like you would shake a thermometer) vigorously over a clean white sheet. If you see a bunch of brown stains, your injectors might just have a bunch of crap accumulated inside that Techron can't take care of. Take GUMOUT an jam that little red tube into the injector and spray some into it. It's a tight fit so some pressure will back up (wear goggles). If the injector srpay patten is better, the injector was clogged and this might save you a few bucks at $25 for a new one.
edu (Volvo mailing list) Date: Mon, 26 Aug 91 9:02:50 MDT My 142 had sat for a number of years before I got it and the K-jetronic (continuous, not mechanical) system was severely gummed and varnished up from the old gasoline. Since I potentially had to replace everything and the 142 wasn't my primary source of transport, I had nothing to lose by doing whatever was necessary, up to and including destroying the particular part, in trying to unclog the system. I started by emptying the old gas from the gas tank, then removing and soaking the in-tank fuel filter in varnish remover for a day until it was cleared. It worked well enough to promptly blow out the aged fuel line up in the engine bay on the upstream side of the clogged main fuel filter. Both were replaced and now I had fuel into and out of the fuel distributer. I was extremely grateful that the fuel distributor hadn't gummed up or rusted and worked on the first try. They got the GUMOUT bath as per Michael's post and were still plugged. So I modified the end of my 110+psi bicycle air pump so I could screw the injectors into it to get a good seal. More soaking and more pumps and I got something resembling a good spray pattern. edu Subject: My experience with reviving a K-Jetronic system > My 142 had sat for a number of years before I got it and the > K-jetronic (continuous, not mechanical) ... Not to be too anal, but shouldn't that be "(continuous, not ELECTRICAL)"? They got the GUMOUT bath as per Michael's > post and were still plugged. Yeah, just soaking them won't cut it since the GUMOUT won't get into the injector unless you jam that little red tube that GUMOUT comes with into the injector and blast the inside. I didn't mention that I ordered *1* new injector just in case one of them was bad or I scrweed one up somehow. It was interesting to note that the spray pattern on the new injector was significantly better than the best old injector after it was cleaned so there's something to be said for replacing with new injectors on a car that has 150,000 miles (mine). Also interesting to note is that Techron isn't very effective with this type of gunk. It IS however effective at PREVENTING the buildup, but it's kind of pricey to add it every tankful. More soaking and more pumps and I > got something resembling a good spray pattern. EDU> >Subject: My experience with reviving a K-Jetronic system >> My 142 had sat for a number of years before I got it and the >> K-jetronic (continuous, not mechanical) ... They got the GUMOUT bath as per Michael's >> post and were still plugged. i drove 1972 142 and 1973 145 fuel injected models before my current 245. volvo replaced the injectors on the 1972 via a factory recall in 1976, and i changed all the injectors on the 1973 when i had the engine rebuilt. Right now the dealers all sell you an injector cleaner at every tune up for the 245, even though the current gasolines are formulated not to vlog injectors, according to i think it is bmw tests. they also say that you should use the most expensive gas around. have the injectors changed, or is the current injection system inferior to the one used in the '72-'73 cars. with all these precautions, the car seems to need an injector cleaning every serice period. when i say i used the cheapest leaded gas available, i mean it: i used sellers like town pump and marvin the stinker when touring the country. edu Subject: My experience with reviving a K-Jetronic system > i find this quite interesting. i drove 1972 142 and 1973 145 fuel > injected models before my current 245. Suffice it to say that the spray pattern was distinctly difference (better) after cleaning the injector and also compared to just replacing it. On your 72 and 73 you might not notice much difference with a lousy spray pattern, but with my '81 V6 there's a remarkable difference in idle, and acceleration. Not much different, however, I believe that quality of fuel available since the 70's crisis has gone down hill. The alcohol rips the crap outa the plastic lines and lots of tiny little bits of black crud clog the injectors. The mechanical injectors aren't as sensative as the electrical however. If they are using TECHRON, that could just be your intake valves getting cleaned up that makes it run a bit better. I'll be looking into what improvements have been made by Datsun. Wouldn't have an electrical system after using this one. edu (Volvo mailing list) Date: Tue, 27 Aug 91 8:23:18 MDT >> My 142 had sat for a number of years before I got it and the >> K-jetronic (continuous, not mechanical) ... Yup, once again illustrating the dangers of reaching for the Reply button before reaching for that first cup-o-mud in the morning. More soaking and more pumps and I >> got something resembling a good spray pattern. Slowly increase the opening on the business end of the pump with a round, rat-tail file until you get a thread of the injector to take. Screw in the injector until you get a seal between it and the rubber bit on the inside of the pump head. Fill the injector with your favorite toxic cleaning material, carefully screw it into your pump and give it a hearty pump.
edu Subject: Two things: Injector dissection and Need wheels... Having replaced the inectors on my '84 GLT this weekend (at 160k they've seen their days) I decided to get curious and hacksaw open one of the old ones. From the top, the triangle is flat on both sides and has a SCREEN through which the fuel flows. This explain the brown crud that came out of the ones I cleaned. It also explains why when I cleaned one, the spray pattern got worse (I loosened some crud up and it clogged the screen more/differently). Using the spring retainer from one of the butchered ones, I'm able to hold the injector open fromt he outside and force fuel in the opposite direction to back flush the screen. Also, I'm looking for the OEM 15" steel wheels off an '90 or '91 700 series.
Amazingly, a very similar thing just happened with my 142 too this last weekend. Maybe it's the increased thermal expansion that comes with the warm day/cold night temperatures time we're starting to experience. Then, I was at the local shopping center and it refused to start at all. gas stance (ie turns over just fine, but the injectors are dry and won't fire). With the injectors dry, I figured that the fuel pump had failed. But since pulling the pump is such a pain, I decided to double check the electrics first. Ignition on, air cover off, I lifted the air flow plate and didn't hear the fuel pump relay click. Get out the Haynes, Where is the juice supposed to be coming from? Off the side of the coil where the lead from the Capacitive Discharge box comes in. Check the voltage there and after scratching the metal a bit, there's 12V. Check continuity to the relay and there's nothing until I scratch the metal some. Get out the brillo pad, clean all the connections up and it starts on the first try. Check the FI lead at the positive battery post, and also the FI fuse and it's holder near the battery junction box. The guy that wrote in said the problem was caused by corrosion at the battery connection which reduces the voltage to the FI computer. This voltage ...
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