my car is in limp mode. need help

[Robert Clark]

hey guys, i got a problem here.
95 pontiac grand prix with the 3.1 engine.
it has gone in limp mode. and i cant pull codes, its the obd 1.5

i have replace
spark plugs
spark plug wires
fuel filter
map sesnor

those havent fixxed anything.

Topic

[Richard Kirshy]

Unfortunately, your taking shots in the dark with the parts cannon.
You will need to pull any possible codes to give some kind of direction to lead to a repair.

[Robert Clark]

forgot to add, that the car will only go into 1 and 2nd gear and wont go pass 50mph.

[Robert Clark]

replaced
air filter
fuel filter
tps
idle control
egr
camshaft sensor

still wont go pass 2nd gear.the car struggles to gain speed

[Eric Lambousy]

What did the plugs look like? What was the result of the testing you did to see if each cylinder had spark? What was the fuel pressure? Is there any engine coolant in the reservoir? What is the oil level? Are there any fluid level sensors? Did you test the vehicle speed sensor?

[Robert Clark]

levels are good.
all cylinders have spark (bright blue)
spark plugs were clean( no oil or coolant)
fuel pressure is 41 at idle.really cant test going down the road
and i have change the vehicle speed sensor.

it idle fine,starts right up. rev fine.

[Robert Clark]

check fuel pressure again. this morning and its below 41 psi its around 35pis and car is running like crap

[Eric Lambousy]

35 psi may be too low for the engine to run. Find out what the psi is supposed to be and compare the reading you got. Dont replace the fuel pump before you test the pump and verify that the fuel pump is getting 12 volts of power and has a good ground.
Always check the circuit for power and ground on electronic parts’ circuits because if there is a poor electrical connection or a broken/damaged wire, you will end up replacing a part that is in working order.

[Author]

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