Hi, did a motor rebuild as #1 cyl was toast. replaced plugs, leads, dist cap, rotor and cleaned fuel tank. changed fuel filter twice. problem is, when van is driven over 20kms distance, it starts to stutter.revs drop down. compression is ok. fuel is ok. new battery, charge sys is a bit low but not enough to make a difference (13.9 v).
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Re: 1981 Vanagon (air cooled) hot stutter
Change the flexible feed pipe for the servo it runs off the inlet manifold left side to a metal pipe,if this goes porous then idle is rough brakes dont work right and as it get hot it will run like a demented old woman who smoke 80 a day
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could be your coil, but can also be internal, have you replaced both the air & fuel filters ? if so, dump some good fuel injector cleaner into tank when half empty , top off with 91-92 octane fuel, see how that works for you, do some highway driving, stop & go traffic creates problems, todays fuel w/ethonal is bad for older cars, be sure to have code cleared from ecm !
1/ Have you fitted the spark plug leads in the proper firing order.
2/ Look inside the top of distributor Top (this is not the first time a new distributer cap has very small crack) or the rotor arm is fitting the cap properly. Hope this helps Best Wishes, Malcolm Campbell.
okay remove your driverside sparkplug the one closes to the front this should be #1 piston put a screw driver in the hole but dont let it bind, slowly click the starter until the srew driver come up all the way up this is top dead center TDC now look at the rotor and where the cap lines up this #1 second is#8 piston on the pass side closes to the fire wall or cab so, on the engine #1 piston234 onthe driver side 5678 on the pass side and in order on the cap it should be 1 8 4 3 6 5 7 2 also make sure you didnt drop the dist in wrong and hav it 180 degrees backwards dont get frustated stop and try again later also make sure this is the right firing order for your dodge i gave you a chevy fire order but i am almost positve this is the order for all v8s
Look for a vaccum leak, the many vaccum hoses on a Vanagon motor are mostly covered with cloth, if you pull off the hose and look at the end, you may find a crack in the rubber. This leads to air leaks and can cause the timing not to advance properly when you give it gas.
You should also check for fuel leaks, as the old rubber fuel lines can fail and lead to an engine fire. Very common, and if your fuel lines have not be replaced, do it now!
Lots of good information of vanagon.com web-site.
Also, be sure to check to see that your air filter is clean and all the connections around the filter and to your Air Flow Meter are secure. Both electrical and air.
I agree, jumped timing. Check to make sure the dist is tight. Than check for tdc on the #1 cylinder. When the #1 cyl is TDC the rotor should be pointing to that wire on the cap. Take the cap off while checking. Also is easier to turn motor by hand without plugs in motor.