Turismo L4-135 2.2L SOHC (1985)
Powertrain Control Module: All Technical Service Bulletins
ECM - Warm Surge & Bucking Except H.O.
Models
1985 "L" Body Equipped With 2.2L 2BBL Engine & Manual Transaxle (Except for High Output Engines)
Subject
Warm Surge & Bucking
Index
DRIVEABILITY
Date
August 17, 1987
No..
18-15-87 (C14-18)
P-2873
SYMPTOM/CONDITION
A surge and/or bucking condition may be noticed during a light throttle, high rpm cruise (as in stop and go traffic, parking lot cruise, etc.).
The following repair does not apply to those vehicles equipped with the 2.2L 2BBL high output engine (designated by an "8" in the eighth character of
the VIN).
DIAGNOSIS
With vehicle at full operating temperature, install a tachometer (if vehicle is not equipped with tach) and road test vehicle. Accelerate and hold engine
between 2000-3000 rpm in second gear. Then decelerate slightly (without closing throttle). If vehicle exhibits a surge while holding between 2000-3000
rpm, or starts to buck during a slight deceleration, perform the following repair procedure.
PARTS REQUIRED
Driveability Kit PN 4419445
Consists of:
1
ESA Module
PN 5233524
1
Vacuum Hose Routing Label (California)
PN 4300451
1
Vacuum Delay Valve (1 second)
PN 4443194
1
Authorized Modification Label
PN 4275086
REPAIR PROCEDURE
This repair will reduce the above conditions by installing a revised ESA module and vacuum delay valve to allow a slightly richer fuel mixture during
periods of high vacuum and high rpm.
ESA module, PN 5233524, also includes all of the prior improvements made to the original ESA module for cold start driveway die outs and cold sag on
acceleration.
1.
Replace existing ESA module with new ESA module, PN 5233524, per the service manual procedure.
2.
Install the vacuum delay valve, PN 4443194, into the vacuum supply hose at the ESA module, 6" to 8" from the formed horseshoe shaped bend.
Be sure that the "vacuum" side of the valve (labeled) points toward the dash panel and not toward the ESA module.
