1992 pontiac grand prix

Engine size = 3.4 liter
Check engine light
GM Computer codes 13,33,35,44

Replaced intake manifold gasket

GM tech jk
question = the engine would idle up real high when started each morn, now
after gasket replaced the engine idles normal,,now engine lite comes on
,,where is the o2 sensor and is it hard to replace? Will it make the car hard
to start in morn when cold,,26degrees outside.






JK:
The oxygen sensor is on the top of the rear exhaust manifold. Will need to
slave the motor forward by removing the front upper engine dogbone
mounts, then slave motor forward. Oxygen sensor should not cause a hard
start. Possible left a vacuum hose unplugged. Down near the PVC valve is
a common area.
1991 Pontiac Grand Prix LE 3.1L V6
Replaced Fuel Filter
GM tech = JK
question = My car started periodically shutting off when driving. Usually takes a couple of times to
get restarted. I had a mechanic check the car out and he found no codes and could not get car to
shut off. He tested the fuel pump psi and said it was 35 when running, but went psi dropped when
accelerating. He recommended changing the fuel pump, but also said problem could be the crank
sensor. What do you think I should change 1st. Where is the crank sensor located on my car?

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