The one with the electrical connector hooked to it. Because the burn requires a fixed time, spark must start earlier as engine speed increases due to less available combustion time. What would happen is your spark would be retarding when it should be advancing. I noticed that there was a cap on the vent side. When I take the valve out, no hesitation. Hey, So let's start by being Honest. Jerry Have you verified that the advance diaphragm on the distributor is capable of holding vacuum, and that when vacuum is applied it advances the spark? I was considering putting one in, but it would have really just been a band-aid for a deeper problem.
Some of the vacuum ports on the carburetor will be marked with an upper case letter cast into the carburetor body adjacent to the ports. There is alot of information in this book that is very helpful. I use the hood sticker for tracing things. For more information go to. Now, I'm no tree-hugger, but I don't see the point in pissing off the people following behind me when there's no benefit to be gained. It's interesting that it isn't illustrated on the emission control label.
The hesitation drives me nuts. The solenoid did not move to allow the vacuum to pass. So we chose a stock-replacement vacuum-advance unit that operated with the least amount of vacuum hoping it would fully deploy at idle. For those without a parts catalog who may not be clear on what this thing is, it is a little plastic cylinder like a top hat, about an inch and a half tall and about the same in diameter. At least I hope that'll be alright There is no Check Valve on the on the Tip-In Switch Vacuum line.
Since 1918, Dorman Products has supplied the automotive aftermarket with high-quality replacement parts, hardware and fasteners. Awesome, I just ordered some Vacuum caps so I dont have to use screws and have hoses hanging around. It says that a spark delay valve is incorperated in the system to delay spark vacuum to the distributor diaphragm unit for a predetermined time. We also set both carburetors leaner, which certainly contributed to the fuel economy increase of nearly 2 mpg we saw from both vehicles. Not only is such a mixture more difficult to ignite, the flame spreads slower, delaying peak pressure. The large camshaft seemed much tamer, and idle quality was smooth and stable.
Modifying The Carburetor Whenever an engine is modified to increase power, the carburetor needs to supply additional fuel. The one with the electrical connector hooked to it. I may still have a vacuum leak - so I'll be tracing hoses to make sure. After the preliminary adjustments, idle quality noticeably improved, and vacuum jumped roughly 1. Edit: what about vacuum leaks? I checked timing not tool long ago and it was ok, back but I will recheck. Hell even passed emissions without them. Threw them away and car runs the same.
If everything is connected as it should be, and functioning as it should be, and if the base timing is set correctly, you should not be having hesitation problems. Especially if one of them has a light bar on his roof. We did not, however, expect or notice any real difference in part-throttle response over ported vacuum. What ended up being the problem was the damper and consequently the timing. It is an Replacement unit at an affordable price; perfect for your maintenance and restoration projects.
If you know your Year Make Model, put it in the selector so that we can guide you to a product that fits your vehicle. Is the one that comes staight out from the top of engine next to the thermostas housing. Save time and money with our Engine Valve Cover. I took some more pictures since changing the lines. Special thanks to Jim Hand for his assistance. Engine Performance problem 1985 Other Chevrolet Models V8 Two Wheel Drive Automatic I need help with the vacuum line on my chevy c-10.
Somebody else can fill in these details if they're so inclined. The load generated by placing the automatic transmission into gear seemed to affect the engine less, another indication that it was operating more efficiently on the available fuel mixture. My truck has a Z-code 4. From their legendary gaskets, to interior and exterior accessories, Mr. What would happen is your spark would be retarding when it should be advancing. There could be other reasons for the hesitation, but you need to make sure the advance system is working properly first.