The engine is the 3.8L V6 in an 87 Ciera Brougham, Auto Transmission,
fuel injected 86k miles (my great-aunts old car- thus the low mileage)
Originally the car would cut off when mildly accelerating at around
20-30 mph. The camshaft position sensor was replaced as a possible
remedy. Now the car will run, but it seems to miss badly around 30 mph
or so. The car will get up to a respectable speed (60mph or so) but
continues to stumble at various speeds. The error codes were retreived
by shorting the A and B pins in the datalink terminal. Retrieved
codes: 32- EGR circuit on fuel injected models and 24- Vehicle Speed
Sensor or circuit. According to the (admittedly un-thorough) Haynes
manual the VSS only controls the torque converter. The EGR valve will
function but it is getting no vacuum through the EGR vacuum solenoid
(small rectangular box with a vacuum inlet and outlet, a 4 plug
connector, and a small tiny air filter mounted on it) Anyone worked on
this engine before? Any pros out there? PS- Checked fuel pressure
-30PSI on the fuel delivery rail.
Thanks so much!
I have a 1987 LeSabre. IIRC, the engines are identical.
I'd suspect the MAF, fuel pump, EGR system, or timing system.
If it's running rough at an idle, but otherwise runs fine - sort of a
wobbling rpm at idle, that's the fuel pump. If you can hear it
whining or at all at highway speed, it's wearing out. Mine makes
a very loud racket - probably has 10K left on it or less.
If it runs really rough but is fine after a few miles or if you
let it run until warm and then turn it off and on - and then it
is fine, it's the EGR/recirculation system - basically like
having the choke on all the time.
If it runs fine at idle when warmed up, but then is a mess when you
try to acclerate(virtually no power), it's most likely the MAF or computer
that are having problems.
Timing is something that should be addressed for that year in any case,
unless it was serviced at least once before. The stock timing chain is
likely stretched half and inch or more and several of the nylon/synthetic
teeth on the main cog are likely worn to nubs. Mine had 2-3 teeth left
and the computer could only compensate so much.
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