This engine has points and 4 plugs.So far I have replaced the plug and coil leads and filed the points--minor pitting.Plan to pull the plugs for a look and gapping.Might replace the points and capacitor.Looking for a strobe to set the timing.Owners manual calls for 3 degrees BTDC--how far can one go w/o causing problems?Upon depressing the gas pedal there is some acceleration before going into the bogged mode--upon relaxing the gas pedal 10-20% the engine recovers and resumes a weak acceleration.Strikes me that flooring the gas pedal results in an overly lean mixture and relaxing the pedal gets the mixture back into a useable ratio.Is there carb linkage or cams to take a look at?Other threads speak of the timing belt/chain jumping a cog--don't know which this engine has but don't like the sounds of it--seems like it idles much too well for something that drastic.Any thoughts would be most welcome.LENThis engine has points and 4 plugs.So far I have replaced the plug and coil leads and filed the points--minor pitting.Plan to pull the plugs for a look and gapping.Might replace the points and capacitor.Looking for a strobe to set the timing.Owners manual calls for 3 degrees BTDC--how far can one go w/o causing problems?Upon depressing the gas pedal there is some acceleration before going into the bogged mode--upon relaxing the gas pedal 10-20% the engine recovers and resumes a weak acceleration.Strikes me that flooring the gas pedal results in an overly lean mixture and relaxing the pedal gets the mixture back into a useable ratio.Is there carb linkage or cams to take a look at?Other threads speak of the timing belt/chain jumping a cog--don't know which this engine has but don't like the sounds of it--seems like it idles much too well for something that drastic.Any thoughts would be most welcome.LEN
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What have you done so far? Does your van have electronic ignition or points? If the latter i'd check/replace points, capacitor & white, low tension wire inside distributor. Also check the spark plugs (all four should have the same grey/brown colour) & H.T. lead resistance, especially if the fault occurs under load/acceleration.
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I know you mentioned the EGR valve has been replaced, but you may have a bad 'new' part. I know the car is electronic, but has anyone checked its ignition timing (timing belt been looked at, I know it only has 77k on it). Is the fuel pressure regulator OK and it vacumm supply?
i had a van do this same thing to a tee turned out to be a broken key pin in the harmonic balencer causing the timing to ****** replaced balencer and ran like a dream there is a crank sensor grid on the balencer when the key pin broke it trew the timing off
Even though this is an old post i feel it needs an answer since there is 225 followers wanting an answer. This situation sounds as if this vehicle is either suffering from the Throttle Position Sensor switch which has bad spots in it causing lack of voltage or the Fuel rail pressure regulator which can not keep the fuel pressure built up in the fuel rail making the auto veel like it is running out of fuel.And the transmission speed densor which also controls fuel. The situations for each device has a test that can be done to determine which one it is. And last but not least lets never forget our fuel filter this can cause the exact same problem. I am eliminating the cam sensor because it stabilizes at idle. Eliminating the crank sensor because it too at idle also stabilizes and returns a smooth idle. So a fueling problem is what we have here one of the above. Enjoy and if you need help determining which one just ask me I will help you figure it out. Please rate my advise thanks it is how i receive my achievements.
This engine has points and 4 plugs. So far I have replaced the plug and coil leads and filed the points--minor pitting. Plan to pull the plugs for a look and gapping. Might replace the points and capacitor. Looking for a strobe to set the timing. Owners manual calls for 3 degrees BTDC--how far can one go w/o causing problems? Upon depressing the gas pedal there is some acceleration before going into the bogged mode--upon relaxing the gas pedal 10-20% the engine recovers and resumes a weak acceleration. Strikes me that flooring the gas pedal results in an overly lean mixture and relaxing the pedal gets the mixture back into a useable ratio. Is there carb linkage or cams to take a look at? Other threads speak of the timing belt/chain jumping a cog--don't know which this engine has but don't like the sounds of it--seems like it idles much too well for something that drastic. Any thoughts would be most welcome. LEN
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