Question about Volkswagen Microbus

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76 bus misses and backfires at about 200 to 2500 rpm.

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Might be time for a tune up.
if that doesn't work than it is a problem with the cylinders, rockers, air intake, headers,and/or fuel injectors.

Posted on Jun 24, 2009

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Posted on Jan 02, 2017

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Loss speedometer and tackmoter in my 2005 jeep grand Cherokee what could it be odemeter still works


the cluster in the the car, is standalone,
its just a display and has self test you can do.
http://www.fixkick.com/Jeeps/jeeps.html#cluster

Check both cluster fuses in the fuse box yet?
one is power other is memory.

if that test passes, and you
THEN PCM, did you scan it yet? (any modern $10 scan tool works here) can-bus rated, scan tools are Ubiquious now.
not scanning the car, and missing can-bus errors is bad idea.
or missing PCM can't talk to the display(cluster) misses the boat.
or VSS errors, or any TCM errors, or other errors, DO SAY THEM.


the PCM sees RPM or the engine can't run , with dead cam or crank sensors. so right off the bat I know PCM is sending RPM .(tacho)

the speed can be checked with any scan tool made (rpm /speed)
plug in scan tool and drive, and have helper read the PID called, SPEED . (vss speed) cheap tools can do live data stream.
on ANY PID. (pids are live parameters by number)

do not guess. here, scan it first.
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1 Answer

Missing and backfiring in 1987 honda civic


Check the following items:
- Check the spark plug gaps. (0.90 - 1.0 mm)
- Check the resistance of spark plug high tension cords (10 K Ohms - 25 K Ohms)
- Check the distributor cap and rotor for cracks and or corrosion.
- Check ignition timing (17 degrees at 750 rpm)

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Something like this is often a stuck or poorly sealing valve. A Vacuum gauge is the least obtrusive way to notice vacuum changes. If a cylinder fails to seal, vacuum will reflect the loss of compression and it will result in a bounce on the meter.

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Suddenly started missing badly and backfiring at


could be a mass air flow sensor, or a bad fuel pump.

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Has the Optispark distributor cap been replaced yet, if not have it replaced.

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the cat would have been supplying a certain amount of back pressure if everthing else check out fine ie compression put a cat back on

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Engine starts,reaches high rpm,then slowly returns to a rough idle, misses badly,no backfire,surges as if searching/adjusting air/ fuel/est,timing light shows mark constantly changing/erratic,engine then...


Vacuum leaks. Check all hoses and intake bolts. Leaking EGR or plugged PCV valve. Air filter plugged. Leaking head gasket. Worn timing chain. Camshaft lobes worn. Valves burned or leaking. Fuel idle control system or sensor. Good luck!

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I believe that you may just have a bad float in the carburator i had the same problem in a similar truck after i rebuilt the carb and also changed the float it solved the problem.

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98Eclipse 2.0 nonTurbo 5speed 180,000 miles ,code PO301


The po301 is a misfire code. The backfire can be caused by a excessive amount of fuel, bad valve timing etc.
My guess is you have damage to an exhaust valve that may have occurred when you had the timing belt problem.A compression test will indicate if you have a leaking exhaust valve.The reason for the backfire is the exhaust valve is still partially open when the spark plug fires.

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