Question about 1997 Pontiac Grand Prix

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Air conditioning output seems to be partially blocked at times Most of the time it works fine, however at times even on Max, there is an unusual blowing sound from under the dash and the air output seems to be diminished/partially blocked. Then, later it's working fine again.

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  • Pontiac Master
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Sounds kind of strange. Check cabin air filter.

Posted on Jul 28, 2010

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Acceleration flattens out over 3,000rpm, won't go over 4,000. code 0121 TPS-tested fine, replaced it anyway still have same problem. It doesn't ****, buck, idles fine. No other codes or drivablilty


Hm. without knowing what car/engine, I'll be guessing. Could be a clogged air cleaner, partially blocked exhaust, partially blocked fuel line.

Jan 01, 2015 | Cars & Trucks

1 Answer

What would cause lack of pulling power?


check ignition timing, exhaust system for blockages, fuel pressure ,injector tip condition, blocked air filter. Run the fault codes to check for faulty sensors.

Aug 12, 2014 | 1991 Mitsubishi Mighty Max

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How can I figure out what's squealing? Where can I find belt diagrams?


I had something similar with two seperate vehicles after replacing everything I could think of it turned out to be a bad bearing in my alternator on both vehicles.

Aug 04, 2014 | 2005 Hyundai Elantra GLS

1 Answer

Thermostat replace


thermostats are always a common culprit for over heating but outer items like poor fin condition on the cores , blocked or partially blocked cores, lack of anti freeze -anti boil coolant, coolant fan not working. timing problems with the ignition, air -fuel ratio not right (too lean) gear selection ( OD not working) fan belt loose. A simple test for a thermostat operation is to start the engine cold and time how long it takes before you can feel hot water in the top radiator hose . 10 minutes at idle would be about right and if you feel the hose start to get hot then the thermostat is opening

Dec 16, 2013 | 2006 Mitsubishi Lancer

1 Answer

2001 suburban air condition wiring diagram


I would change the pressure switch and it just turns in and out and it won't loose R134a. The one switch should be on the dryer bottle with two wires plug.

May 22, 2017 | Cars & Trucks

1 Answer

Airco seems to blow hot air most of the times, but cold occasionally


Seems like the blend door is intermittent,Like you said in some cases it works fine,Either the blend door is intermitent or the cycling switch is intermittent this is located on the filter drier when this pressure switch fails the A/C goes intermittent

Nov 23, 2012 | Cars & Trucks

1 Answer

My sons 88 Mighty max runs terrible at about 35 mph and up. Seems to run betterhe air temp is cooler, like 60's and lower. We replaced plugs/wires, cap/rotor, fuel pump, air/fuel filters, some que


Air is more dense at lower temperatures so the cylinders fill better and there is some evidence increased humidity also helps engines to run better.

Replacing stuff in the vague hope it will provide a cure can be expensive and very frustrating and is no substitute for proper checks and replacing only what proves to be faulty.

New plugs won't improve matters if the spark is really weak and a new fuel pump is really money down the drain if the pressure regulator is faulty or the injectors aren't spraying properly or the carb has some blocked jets or if the oxygen sensor is sending the wrong information...

It is best practice to always start with the basics - engine condition, timing, compressions, cylinder leakage and so forth. Your description indicates the engine is short of fuel or fuel that it can use but could equally be caused by a restricted exhaust. I once had a car just like that and it was a worn exhaust cam lobe that was causing the trouble.

Jul 03, 2017 | 1988 Mitsubishi Mighty Max

1 Answer

1996 mitsubishi shogun loss of power


Hi Trevor, Please let us have the engine type, as that will help us help you diagnose the problem. In the meantime here are some suggestions. take off the ducting to the turbo and look to see if there is oil contamination in the inlet from the turbo. It is not unusual for those units to become worn and then begin burning oil by leaking it past the seals. If the turbo shaft has any drag, that would also indicate excessive wear, indicating a replacement is required. If the head and rotor are damaged or worn, that would usually present as a problem with starting, especially when cold. Defective injectors could also cause the problem. Piston rings may also be damaged and worn. It is advisable to service turbo induction vehicles used in dusty conditions every four thousand kilometers, much less than normally recommended by manufactures. I would hope that you have replaced the filters with new and that they are of good quality. If they are substandard, they could be blocking fuel flow to the injector pump. Let me know how you get on. Regards John

Apr 25, 2012 | Mitsubishi Pajero Cars & Trucks

3 Answers

My 2004 sentra is overheating the thermostat has been replaced the spark plugs have been replaced and i have flushed the radiator with no avail. my water pump is not leaking and seems to be running fine....


You need to check the fan on the radiator. Also check the nozzles for the input and output from the radiator. If the nozzle at the radiator inlet is not hot, then the problem is in the cooling system. If the nozzle from the radiator is hot, then the problem is in the radiator. Be careful not to burn yourself.

Sep 06, 2017 | 2004 Nissan Sentra

1 Answer

I am having ongoing problems with the truck miss firing and rough running. Timing is ok, replaced cap and rotor,coil. It still starts rough,idles rough and misses when at cruising speed,although it seems...


Misfire is a common driveability problem that may or may not be easy to diagnose, depending on the cause. A misfiring cylinder in a four-cylinder engine is, pardon the pun, hard to miss. The loss of 25% of the engine's power output is the equivalent of a horse trying to run on three legs. The engine may shake so badly at idle that it causes vibrations that can be felt in the steering wheel and throughout the vehicle. The engine also may be hard to start and may even stall at idle, depending on the accessory load (air conditioning, headlights and electric rear defroster, for example).

When misfire occurs, performance suffers along with fuel economy, emissions and idle quality. And, when a misfiring vehicle is subjected to an emissions test, it will usually fail because of the unusually high levels of hydrocarbons (HC) in the exhaust.

What causes a cylinder to misfire? Basically, it's one of three things: loss of spark; the air/fuel mixture is too far out of balance to ignite; or loss of compression. Loss of spark includes anything that prevents coil voltage from jumping the electrode gap at the end of the spark plug. Causes include worn, fouled or damaged spark plugs, bad spark plug wires or even a cracked distributor cap. A weak coil or excessive rotor gas inside a distributor would affect all cylinders, not just a single cylinder.

"Lean misfire" can occur when the air/fuel mixture is too lean (not enough gasoline in the mixture) to burn. This can be caused by a dirty, clogged or inoperative fuel injector; air leaks; or low fuel pressure because of a weak pump, restricted filter or leaky pressure regulator. Low fuel pressure would affect all cylinders rather than an individual cylinder, as would most air leaks. A leaky EGR valve can also have the same effect as an air leak.

Loss of compression means the cylinder loses most of its air/fuel mixture before it can be ignited. The most likely causes here are a leaky (burned) exhaust valve or a blown head gasket. If two adjacent cylinders are misfiring, it's likely the head gasket between them has failed. Also, if an engine is overheating or losing coolant, it's likely the head gasket is the culprit.

Intermittent misfires are the worst kind to diagnose because the misfire comes and goes depending on engine load or operating conditions. They seem to occur for no apparent reason. The engine may only misfire and run rough when cold but then smooth out as it warms up. Or, it may start and idle fine but then misfire or hesitate when it comes under load. Also, it may run fine most of the time but suddenly misfire or cut out for no apparent reason. Intermittent misfires can be a real challenge to diagnose, so let's start with a steady misfire in one cylinder before moving on to intermittent misfires.

Hope this help.

Mar 25, 2010 | 1989 GMC Sierra

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