Hi, I'm looking for the throttle plate on my 2004 pontiac bonneville. I am trying to do a fuel system tune-up and I am having trouble locating where this is to clean it out.

How long since a tune-up? Are there any applicable trouble codes? Some of the national brand auto stores will check codes free. Does it stall at idle or going down the highway?
With extended crank, have a helper crank it while you visually check for spark at the spark plugs. If spark everywhere, use a gage and check proper fuel pressure and check fuel injector pulse.

If injector pulse is missing when problem is ongoing, two things I think of, do you have an rpm signal and security system where applicable. The rpm signal comes from crank sensor. Intermittent problems can be a pain to track. Don't replace anything unless your testing points in that direction.

Well pumping the pedal on a fuel injected car does nothing. If there are no trouble codes stored in the computer, look for excessive fuel from the injectors or the fuel pressure regulator. Or lack of air thru the idle air control valve.

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Hi,

My name is Ben and I'm your guru, i.e., mentor, an influential teacher or popular expert: a management guru. - origin from Sanskrit, 'weighty, grave', for today.

Your fuel filter is located under the chassis, on the passenger side, beneath the rear door.

Be sure to remove the pressure before disconnecting.

All the best,

Ben

check that the throttle plates are not all carboned up. The 3.4 and 3.1 l gm engines are know for that. I have seen no starts or hard starts hot for that problem.

The thermostat is located behind the metal housing that is bolted to the intake manifold on the drivers side of the engine below the throttle body.

There are 2 bolts holding the hosing on. A 13mm swivel socket and a 13mm wrench will be needed to remove the bolts.

Sometimes it is easier to remove the throttle body if it is your first time. It will let you see what you are doing a little better.

1. remove the air cleaner cover and hose attached to the throttle body.
2. remove the throttle body (optional)
3. Using a swivel socket and wrench remove the 2 bolts holding the thermostat housing from the intake manifold.



I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

It could be that you have picked up a batch of dirty fuel that has clogged the gauze input filter that is part ot the fuel pump inside the fuel tank.

try replacing the throttle position sensor

Yes..there is either one inside your glove compartment or its on the floor near the drivers seat or located low on the dash..i hope this will help..Keith

It is located under the drivers side floor acessable from under the vehicle. For pics and instructions check out .http://www.pfyc.com/supportfiles/gasfilter/

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I'm venturing to guess that a 1990 lemans is fuel injected. then you wouldn't have a choke plate. I would start by checking the iginition system first, plugs, wires, cap, rotor, and if all that looks good then look at the fuel system.