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78 TBI engine hesitation (2.2/2.5)




Description

This article is from the Chrysler-Plymouth-Dodge FAQ, by Dr. David Zatz with numerous contributions by others.

78 TBI engine hesitation (2.2/2.5)

2.5 liter, TBI: Intermittent engine hesitation under high speed driving
ONLY or under moderately high speed and heavy acceleration. The problem
NEVER occurs during moderate driving or heavy acceleration at low to
moderate speeds.

The brass pin you see from the top of the injector they didn't make it a
tight enough fit.
Eventually the
pin begins to back out and the ECM keeps shortening the injector pulse
to compensate for the change in mixture. The process can take several
months before it produces symptoms. The pin
backs out to a point that the ECM can no longer compensate for and you
get driveability problems. (dotto)

First check fuel pressure, around 14.5 psi engine off (using DRB in
actuator test) I have seen the distributor pick-up unit on these
cut out intermittently. When the computer loses the signal from the
distributor, it shuts fuel/spark off. The Hall-effect plate tends to get
loose. One TSB
involves re-locating the MAP sensor from the logic module(right kick panel)
to the right strut
tower. EGR failures are also common. They sometimes get stuck
open and cause hesitation; try disconnecting the vacuum hose
from the EGR valve. The car will probably ping on acceleration, but
hesitation should cease. The valve is located on the driver's side end
of the exhaust manifold. You may have to remove the air cleaner
housing to see it. Faulty TPS sensor can cause this type of problem.
It may have a "dead spot" (Eric Eleazar)

 

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