Civic ed3 d15b4 dual carbs
Hi all
dual carbs are often contaminated with fuel deposits, mostly caused by evaporates that clog carby jets, airways and internal surfaces. This is particularly so with vehicles left standing in hot sun. Never buy a used old honda from a car yard without demanding the Caltex Techron 5000 treatment prior to payment. Techron 5000 will dissolve all fuel contaminates over a period of about two weeks. Patience is required to force sufficient Techron 5000 true the entire fuel system, about 500 KMS. Do not contemplate interfering with carbs physically until the Techron 5000 solution has been given time to work wonders. Once a year thereafter give the tank a 350 ml dose of Techron 5000 to a 40 ltr tank, use Caltex 98 RON for this dosed tank. I restored a Civic 1991 ed3 that was totally contaminated and inoperable in a fortnight. The dealer dumped the car with 148000 kms, immaculate one only old lady driver in 23 years for $650 as a carby overhaul was quoted at plus $1700, carbies out sent to Sydney cleaned returned and reinstalled. Techron 5000 cost me $15, car is perfect.
First post from a newbie. Regarding d15b4 twin carbies
I've been trolling the civic twin carb forums for a whole week looking for that aha post which solves my carby problem, but so far, no bullseye. The techron 5000 post series really caught my eye and thanks for that info. I remain confident that I can solve the stalling problem without resorting to pulling the carbs off the car.
Some history....Me. a 55yo engineer ex aerospace, electronics ticket and a hoon from way back. First person in oz to design and campaign a nitrous and liquid phase LPG injection system on a 240 zed in 1984. Fast forward to 1996 where I bring home a brand new daughter in our 2 door 92 vintage civic gl. Still have the civic, from new, and that daughter, now full of pierced ears and attitude, is the new owner of that civic. And it stalls. All the time.
You might have guessed I will be fixing this thing myself. So far, I have grabbed a spare set of carbs from the Lonsdale wreckers, today actually, and pulled them to pieces on the dining table. Impressive. Compared to the hitachis on the 240z which I still have, these Keihins have a lot of paths for air and fuel to go. Being an idle problem, I am chasing the likely cause of blockage in the idle circuit. Three circuits are evident. The main jet which is part of the slide piston, a transition circuit which pops out just downstream from the main jet, and finally, the idle circuit which seems to go via a solenoid o the side of each carby. The idle jets exit right at the base of the throttle plate, via a gaggle of tiny holes.
I am convinced those idle holes see no fuel.
The car goes. Mind, it sat asleep for a few years and no doubt got the fuel varnish blues. But to drive it, you have to thrash it. Anything under 1000rpm and she dies. Revs hard to 7000rpm.
OK, what do you guys recommend. Those solenoids look like anti diesel solenoids, and may reveal something if I remove for inspection. Better than a full strip.
By the way, first evidence of this idle problem was one minute after starting with little fuel, after a one year sleep. Looks like clogged jets eh?
Any advice on those solenoids, like are they continuously energised during operation, and the idle circuits in general, would be appreciated. Thanks and hi to all. My daughter has my hoon dna, which is a concern....Keeps pestering me about that old nitrous bottle.
civic ed3 d15b4 twin carbs
Your symptoms are exactly as mine were prior to Techron 5000 treatment. Follow the dosage requirements and be prepared to allow the formula to take time to clean out the deposits. Weeks or hundreds of kilometers are needed. To prevent the problem re occurring either switch over to Caltex 95 RON or as I will do, just give the 40 lt tank a belly full of $15 Techron 5000 every year. For me a year is only about 5000 ks. 91 RON makes no difference to performance or fuel consumption with a 9.2:1 compression engine never exceeding 3250 RPM.