it would be handy to have another AFM to try. Someone mentioned dead spot on your AFM's sweeper contact area ( under the black cover ) . I'll go along with that idea. I had two cases that were clearly the AFM .. first one was an 84 auto trans Westy ...would just 'cut out for a fraction of a second at 70mph .. I think that was a dead spot on the AFM sweeper for sure . another one was a Syncro with 2.1 engine... very subtle uneven running right at 3,100 to 3,200 rpm. Some people wouldn't even notice it. I was reluctant to diagnose 'new AFM' needed as a new one was $ 500. when I found a piece of gear tooth on the trans magnetic drain plug the van's owner said to rebuild trans, and replace clutch and starter ,, so with all that .hey ..what's another 500 dollar part, right ? the new AFM fixed that subltle uneven running for sure. you should at least have a spare to experiement with. I would still go over those things I mentioned. here is one of my long-time diagnostic rules.. when you 'get lost' ....start over. Start over With the Basics ... and keep doing that until either you find something you missed.. or you learn something new and subtle .. 'eventually' you'll get it fixed with that method. lol...one engine I worked on would barely run ..just awful ...loads up, wouldn't wind out ..wouldn't run worth beans.. and one by one things that were not right were found .. significant things ...like 8 'wrong or worn out things' in the course of a week working on it .. and yet.. the same symptoms persisted. Also ran up against lack of money for 'test parts' like in your case a known-good AFM .. lack of parts for that model and lack of tech info too . I would have invested in a throttle body in that particular case buy the owner didn't want to. lol..that case is still 'pending'. as always .."it's just a blockage or leakage of fluids or electrons." I promise you that.
On 6/16/2015 9:02 AM, Rocket J Squirrel wrote: > Thanks, Scott. > > I've been through all of these at one point or another when trying to > solve my van's famous "it cuts out repeatedly for a few seconds every > minute or so when driving up very steep grades for a long period of time > in very hot weather" issue. > > -- > Jack "Rocket j Squirrel" Elliott > 1984 Westfalia, auto trans, > Bend, Ore. > > On 06/15/2015 07:15 PM, SDF ( aka ;jim lahey' - Scott ) wrote: >> the normal thing to check or think about in a case like this is Temp >> Sensor II .. >> there are two by your thermostat .. >> a single contact for the gauge .. >> the other one ...check the resistance of that one and compare that to >> what Bentley says. >> >> also ..super important and I find them off all the time.. >> idle switch not making contact at idle. >> >> you might look for tiny air leaks ..( like with spray carb cleaner or a >> listening hose ). >> I had one engine that >> when given throttle it would moan like air was being drawn in .. >> and it ran medium OK .. >> but it seemed very much like it was not getting the fuel injected to go >> with the air. >> >> on that one I found really ..at least 10 tiny air leaks at the intake >> runners..the plenum ..and the throttle body connection >> and that was it. >> >> do these 3 things and there's a fair chance you'll find some some >> things not exactly right. >> >> On 6/15/2015 10:23 AM, Rocket J Squirrel wrote: >>> I've had this same problem for years. But different: mine's a 1.9L, and >>> the problem occurs in cold (read freezing or below) temperatures, >>> with a >>> cold engine. I have this mile-long generally downhill street I go down >>> when I leave the house. It's not long enough for the engine to warm up. >>> At the bottom is a stoplight. Usually red, as such things go. The >>> street >>> turns uphill at this point so there I sit at the limit line with the >>> nose of the van pointing up a very slight grade, the engine idling, a >>> minute or so, then the light turns green, I press on the gas, and the >>> engine grumbles and barely moves the van. Sometimes the engine just >>> dies >>> and I have to restart it to proceed. Not until I've crossed the >>> intersection does it seem to have any power. It's an auto trans so I >>> don't have the luxury of revving the engine and feathering the >>> clutch to >>> get across the intersection. A bit of an inconvenience to myself and >>> those behind me. >>> >>> Once it warms up it's fine. >>> >>> Why does it do this? I don't know. The number of things that would need >>> to be disassembled and tested (or just blindly-replaced) to try to fix >>> the problem is daunting. I'll take the slight inconvenience. >>> >>> -- >>> Jack "Rocket j Squirrel" Elliott >>> 1984 Westfalia, auto trans, >>> Bend, Ore. >>> >>> On 06/15/2015 07:25 AM, Rick Cooper wrote: >>>> I've noticed that when accelerating from an intersection, after >>>> sitting at >>>> a red light, my 2.1 WBX will sometimes hesitate for 5 to 15 seconds. >>>> I'll >>>> start moving, but the engine has no power and giving it more gas does >>>> nothing. After those few seconds, the engine will start to pick up >>>> power >>>> and soon everything will be running fine. >>>> >>>> This has just start happening and is still sporadic, but it is >>>> becoming >>>> more frequent. Seems to only happen after a full stop, like at a red >>>> light. Would this be a clogged fuel filter or what? >>>> >>>> Thanks for any ideas. FWIW, the fuel tank and the ECU were replaced >>>> a few >>>> years ago. >>>> >>>> Rick >>>> >>> >> > |
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