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Car Forum / Honda Cars / April 2005Accord LX 87 Carb adjustment/tuning
Hello! I was working on this a while ago and put it off... now I'm back on it before it starts getting cold again... I rebuilt my Accord's carb, put it back on. The whole thing looks like this now: http://www.photostor.com/img/4223/l The car starts. You have to keep the pedal on, otherwise the engine will die. It goes to 3000 rpm and then starts gradually coming down... you press the pedal a little bit and it shoots up to 3-4k rpm and then it starts coming down again, and so on. My carburetor has 4 adjustment points, refer to the following link: http://members.fortunecity.com/accordex87/carb.htm I need a procedure, a series of steps to adjust/tune the carb starting from scratch (reset all screws to a "close" position; then take screw #1 and turn it clockwise three times, then take screw #2, etc). I'm a complete newbie here and getting this car by myself to work is one of my hobbies. Taking the car to a mechanic shop would be cheating... :) Can someone please help me or point me to the right direction (web sites, publications, etc); anything that addresses this topic on this car/model/year specifically? Thanks! mc > Hello! > [quoted text clipped - 3 lines] > I rebuilt my Accord's carb, put it back on. The whole thing looks like > this now: What kit did you use? Did you use the Honda OE top clean kit? It should have a part number such as 06161-P??-??? where the middle and last set of numbers could likely be PC6-003 or something like that. > http://www.photostor.com/img/4223/l > > The car starts. You have to keep the pedal on, otherwise the engine will > die. It goes to 3000 rpm and then starts gradually coming down... you > press the pedal a little bit and it shoots up to 3-4k rpm and then it > starts coming down again, and so on. Did you replace the carb base gasket? It may be leaking if the car is running lean. Have you tried a propane enrichment test to determine if the it's currently lean or rich? You may be able to get the car to idle on propane. If so, then that would indicate that you have a huge vacuum leak somewhere. Can you see fuel in the sight glass on the side of the carb? It should be at the half-way point right at the center of the black dot. > My carburetor has 4 adjustment points, refer to the following link: > > http://members.fortunecity.com/accordex87/carb.htm I've never seen such a procedure as described on that page to set the idle mixture screw. One typically uses a propane enrichment test. With propane, there should be an idle boost of close to 100 +/- 25 rpm (but that's assuming that the car will idle). I used to typically start with screw backed out about 1.5 turns or so from fully closed. You can make a suitable enrichment test apparatus by using a standard propane torch and control valve. However, remove the flame tip at the end and attach a section of tubing about 3 feet or so. Slowly open up the valve to feed propane directly into the carburetor throat. You can find a factory service manual for an 86 Accord from this site for further info - http://www.pauldesign.ru/honda/shopmanual.html. Eric > What kit did you use? Did you use the Honda OE top clean kit? I used an aftermarket kit I bought at AutoZone (US). > It should have a part number such as 06161-P??-??? where the middle and last set of > numbers could likely be PC6-003 or something like that. I don't have the original box or any other info (this was last year). I do have the instruction sheet and there in the upper right hand corner there's this code: GF5185-1 The drawings and all the parts that came with the kit are match what I found on my Honda carb. > Did you replace the carb base gasket? Yes, I replaced both the O-ring between the carb and the EFE heater and the gasket between the heater and the intake manifold. For added insurance I applied some high-temp red silicone gasket maker between the manifold and the gasket because I noticed some minor scratches on the surface. > It may be leaking if the car is > running lean. Have you tried a propane enrichment test to determine if the > it's currently lean or rich? Have not tried it. It's mentioned in the manuals I have here but it's something I have never done before. Want to make sure I understand the whole process before attempting. > You may be able to get the car to idle on > propane. If so, then that would indicate that you have a huge vacuum leak > somewhere. What an incredible mess is the vacuum system on these cars! Thanks for this tip; I'll be watching out for it. > Can you see fuel in the sight glass on the side of the carb? It > should be at the half-way point right at the center of the black dot. Right now it is a little above the half-way point. > > My carburetor has 4 adjustment points, refer to the following link: > > [quoted text clipped - 14 lines] > > Eric Thanks you for your help! mc Hi. I adjusted the the float level and now it is right in the middle of the glass window. I backed off the idle adjust screws on both sides of the car. I removed a blue goft tee that was blocking an air bleed near the brake booster. The idle mixture screw backed out two turns from fully closed. The engine now stays on, but it will not idle; it stays right around 3000rpm. mc --- > > Hello! > > [quoted text clipped - 40 lines] > > Eric I adjusted the stop throttle screw (screw with the black plastic head) and the engine is now between 2000-2500 rpm. However, it will not stay there, rpms start to drop slowly and I have to press the pedal or the engine will stall. It still will not idle. regards, mc Hi just ended up rebuilding the same carb. Only i had to rest set the ( as you called it) #1 screw and backed off2.5 turns (air/fuel screw) Then had to Adjust the golden screw located at the top of the gas intake which by the way controls the level that the float floats. from 2.25 turns from flat even with the surface of the carb. Now this whole time i had to replace both fuel filters. This allowed the car to idle (rough) then i used a thumb screw driver (filed down purchased at a yardsale) to loosen 1.5 more turn the air/fuel screw which now leave the car running idle and well it runs drives .. all i have to do now is correctly time the (throttle adjustment screw on the left hand side of the carb (mentioned to me that the right side is for CRUSE CONTROL ?) Still the only problems is now that there is a ping from what sounds like a lifter clicking really bad? I dunno.... |
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