Question about 2002 Chevrolet TrailBlazer

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Engine looses power on grades....usually wet and cold conditions but has happened when conditions are dry and engine warmed up. GM Dealer unable to find problem because it hasn't happen when they test driven it.

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Possible you have a fuel pump going bad

Posted on Nov 03, 2010

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Posted on Jan 02, 2017

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Compresssion 2000 4.3 gm motor


Compression depends on many factors and it is most important that all cylinders test within 10% same as the others. Generally, tests are affected by being done with throttle wide open, weather conditions, engine wear, whether you test "wet" or "dry", battery condition, etc. Compression above 120 psi and same on all cylinders is pretty good, while 150 + is very good for most engines.

Jul 28, 2016 | GMC Cars & Trucks

1 Answer

I have a Nissan navara d22 Str 3.0 and is blowing blue smoke mainly from cold start and slowly goes away when warm, does anyone know if this is something major?


for what you to describe to happen means that there is oil in the combustion chamber after you shut down or is getting there before the engine rings have a chance to control the oil on start up
check the viscosity of oil you are using as it may be too heavy for the rings to control
have a dry and wet compression test done to check the condition of the engine

Sep 23, 2015 | Nissan Cars & Trucks

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HOW to get 2006 HHR up to normal engine power? 2006 HHR engine loses power abruptly or barely keep going. "Reduced Engine Power" on display. Chev dealer replaced throttle body; problem persists.


I agree that all this new technology could have been used to make life easier instead of which it has been deliberately and calculatingly misused to make life harder and more expensive.

I suggest obtaining and using an obd recorder. The dealer might have one to loan you.
Plugged into the obd port it continuously records engine management conditions and data to be reviewed later on a standard laptop or desktop computer. It might need an expert to understand what is happening to cause the fault but sometimes that is the best or only way to find an intermittent fault.

There is one condition that can affect some engines without being recorded as a fault and that is a turbo over-boost condition caused by the incorrect operation of the turbo wastegate. This is generally a control or sensor problem and instantly kills the engine power when it happens. Switching off the engine and restarting allows normal driving again until inadvertently too much acceleration is used again and the cycle repeats.

I hope this helps.

Feb 20, 2015 | 2006 Chevrolet HHR

1 Answer

What causes the "Reduced Engine Power", "Service Stability Control" and "Traction Control" warning lights to come on?


the "Reduced Engine Power", problem causes the PCM to disable "Service Stability Control" and "Traction Control" turning on the warning lights to come on for those systems . The reduced engine power is because of a problem with the electronic throttle control system or as GM calls it TAC system . Reduced Engine Power Mode
When the PCM detects a condition with the TAC system, the PCM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions:
• Acceleration limiting--The PCM will continue to use the accelerator pedal for throttle control, however, the vehicle acceleration is limited.
• Limited throttle mode--The PCM will continue to use the accelerator pedal for throttle control, however, the maximum throttle opening is limited.
• Throttle default mode--The PCM will turn OFF the throttle actuator motor and the throttle will return to the spring loaded default position.
• Forced idle mode--The PCM will perform the following actions:
- Limit engine speed to idle by positioning the TP, or by controlling the fuel and spark if the throttle is turned OFF.
- Ignore the accelerator pedal input.
• Engine shutdown mode--The PCM will disable fuel and de-energize the throttle actuator.
© 2017 General Motors Corporation. All rights reserved.



Drive by Wire training Your best bet , take it to a GM dealer

Mar 04, 2017 | 2005 Pontiac Grand Prix GT

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Hard time starting when warm/hot.


This can be due to the Lean condition of the fuel ratio. The heat sensors need to cool down to put the engine into a "cold start routine". If the heat sensors are not cooling, then it will be hard to start.

Poor grade of fuel. Each grade of fuel has an ignition point. With the engine in Lean mode, the flash ratio prevents easy starting. You could also have a bleed down of fuel or a malfunction in the Evaporative emission system. This is now requiring your car to repressurize the system due to a bad solenoid or a faulty emissions line.

I hope my solution is helpful..

Jun 08, 2012 | Honda Cars & Trucks

1 Answer

Volvo V-70 drivetrain & electronics faults


I suspect you have some loose connections or shorts in the wiring harness. I've had similar strange things happen with an Olds Bravada. Various transmission shifting problems, faults, etc. that all seemed to come from the engine's computer system getting incorrect voltages and readings due to wiring faults/shorts.

Dec 16, 2011 | Cars & Trucks

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2004 ford focus ac blows warm when briskly accelerating. not full throttle. moderate acceleration no problem. temp change to warm is fast, 2 seconds, but back to cold, after letting off the gas, takes...


this is by design. under load, the computer will deactivate the air conditioning in order to take the load of the compressor off of the engine, thereby getting more power for required acceleration. the a c light will remain illuminated etc, and after you finish accelerating the air conditioning will resume normal operation.

Jun 26, 2010 | 2004 Ford Focus

1 Answer

Our 2004 ford f350 is leaking real bad, its dumping the coolant(water) out just as fast as we put it in


Usually you can look at the engine and see where the water is staining the metal parts. It can be something extremely simple to fix like a heater hose.

Your radiator can leak and it has 2 main hoses. If the Radiator is dry, the hoses going to the engine are dry, then it is something attached to the motor. The water pump takes more effort to replace.

Autozone and Oreillys have tools to loan for a deposit. There is a Radiator pressure pump which can be used on a cold to warm engine. When you pressurize the system the leak will be easier to detect.

There are Radiator repair shops and Air Conditioning repair shops that both can do the job. Of course the Dealer has the ability to fix your truck too. Make sure you fix this before you ruin your motor.

May 21, 2010 | 2004 Ford F350

1 Answer

My 2004 colorado is misfiring cylinder 3 where are the spark plugs located in this vehicle?


They are under the intake box on top of the engine. If the miss goes away after the engine warms up then the head may be bad. Gm is having problems with these heads leaking air and loosing compression on a cold engine. There is a special policy for this problem, I think it's 7years and 100,000 miles. So if that is what ends up being the problem it will be fixed at the dealer free of charge.

Nov 22, 2009 | 2004 Chevrolet Colorado

1 Answer

Vehicle momentarily loses power while driving then resumes


Sounds like an electrical issue maybe the plug from firewall to cab is loose or on computer is loose, sometimes those coonections or pins get loose,i had a new car with 200 miles on it and it went dead in heavy traffic,had to get towed to dealer they found loose connection!!!!With audible noise when happens tells me its wiring,check all connections and wires to connections make sure there not loose!!!Best of Luck to you!!!!!

Aug 12, 2009 | 2003 Ford Expedition

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