Jump to content

The General Why


Recommended Posts

Not so much a diagnostic problem to solve so much as it's just a generic question:  Why would a car misfire while idling, but not misfire when under acceleration or cruising?  Assume good plugs, wires, coil.


When idling @ 1K:  rrrrrrrrrrrrrrrrrrrrrrrr, (softly) poop, rrrrrrrrrrrrrrrrrrr, (softly) poop poop, rrrrrrrrrr, (softly) poop, rrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr, (softly) poop, poop, ect...


Not even an '02 question per se, more a basic "old car" query.


I'm not a mechanic, but I am interested in the possible reasons why this would happen.  Is it a long list of possible issues or kind of obvious to those with expertise?  


I'm a noob, but I'm going to guess something with the carburetor?

Link to comment
Share on other sites

valve adjustment

compression test

poor condition of valve head and valve seat (do Cylinder leak Test)

spark plug condition / gap / carboned

idle mixture - too rich or too lean

'86 R65 650cc #6128390 22,000m
'64 R27 250cc #383851 18,000m
'11 FORD Transit #T058971 28,000m "Truckette"
'13 500 ABARTH #DT600282 6,666m "TAZIO"

Link to comment
Share on other sites


This topic is now archived and is closed to further replies.

  • BMW Neue Klasse - a birth of a Sports Sedan

    BMW Neue Klasse - a birth of a Sports Sedan

    Unveiling of the Neue Klasse Unveiled in 1961, BMW 1500 sedan was a revolutionary concept at the outset of the '60s. No tail fins or chrome fountains. Instead, what you got was understated and elegant, in a modern sense, exciting to drive as nearly any sports car, and yet still comfortable for four.   The elegant little sedan was an instant sensation. In the 1500, BMW not only found the long-term solution to its dire business straits but, more importantly, created an entirely new
    History of the BMW 2002 and the 02 Series

    History of the BMW 2002 and the 02 Series

    In 1966, BMW was practically unknown in the US unless you were a touring motorcycle enthusiast or had seen an Isetta given away on a quiz show.  BMW’s sales in the US that year were just 1253 cars.  Then BMW 1600-2 came to America’s shores, tripling US sales to 4564 the following year, boosted by favorable articles in the Buff Books. Car and Driver called it “the best $2500 sedan anywhere.”  Road & Track’s road test was equally enthusiastic.  Then, BMW took a cue from American manufacturers,
    The BMW 2002 Production Run

    The BMW 2002 Production Run

    BMW 02 series are like the original Volkswagen Beetles in one way (besides both being German classic cars)—throughout their long production, they all essentially look alike—at least to the uninitiated:  small, boxy, rear-wheel drive, two-door sedan.  Aficionados know better.   Not only were there three other body styles—none, unfortunately, exported to the US—but there were some significant visual and mechanical changes over their eleven-year production run.   I’ve extracted t
  • Upcoming Events

  • Create New...