Question about Hummer H2

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Has little power. I've changed MAF and throttle sensor and air filter,spark plugs. 57,000 miles

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Dave88233, did you ever get to the bottom of your power issue? I have a 2005 h2 with 56k and have the same issue.

Posted on Mar 02, 2012

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I would pull the fuel filter loacted on the frame and blow through it. If it has any resistance, it is plugged and this is the cause of your problems. Let me know what you find.

Posted on Nov 02, 2010

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When my 2002 grand marquis hits about 40-45 it starts to ****. I thought it might be water in the gas but I have put in seafoam and dry gas with no change. You don't feel it when you are accelerating...


Waste of money to add ANYTHING TO FUEL TANK
Non of those products are necessary or do much

The spark plugs get changed every 3 years or a little
more & not more than 60,000 to 70,000 miles on them

You could have ignition misfires, very common on all
ford products (not from the spark plugs)

I would be disconnecting any vacuum hoses to the
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If so,replace egr valve. (another ford problem)

The front 2 -- O2 Sensors (ones closest to engine,before
or in the inlet of exhaust converter,get replaced every 100,000
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Clean MAF Sensor --- in inlet air ducting (between air filter &
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While changing Trans Fluid ---fixes nothing --- it should be done on
ALL Vehicles, every 3 years & NEVER over 30,000 miles
Change NOT FLUSH

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I have a 2005 f150 with a 5.4 and am getting a code po506 what is this!


PO506 --- Idle Air Control System RPM lower then expected

Clean Throttle Plate
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Ducting from air filter to throttle,loose or a vacuum leak
Throttle Body Leaking
MAF Sensor
IAC Valve gasket
Egr Gasket
PCV Seal

Hopefully you have installed new spark plugs since 2005
Also replaced the front (2) O2 Sensors at 100,000 miles
Cleaned MAF Sensor once or twice a year

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I have a lexus es300 platnium i want to give it a tune up what do i have to buy


All I would do is spark plugs

The cars computer has been tuning all
engines for 30 years now

You can do the air filter,gas filter if not
done in 3 years

Clean the throttle plate and MAF Sensor

Install front 2 -- O2 Sensors at 100,000 miles

Brake fluid every 2 years

Trans & Power Steering fluids every 30,000 mile

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Air Filter-clean or replace
Clean MAF Sensor--CRC MAF Cleaner
Clean throttle plate-CRC Throttle Body Cleaner
Spark Plugs- replace every 70,000 miles
Check -for vacuum leaks on ALL ducting and hoses
Replace front 2- O2 Sensors-ones closest to motor ,every 100,000 miles

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What does a major tune up for a 2004 chevy impala consist of? What should be done and needs to be done?


New spark plugs, oil and oil filter, transmission flush and fill, fuel filter, air filter, coolant flush and fill, clean throttle body plate and bore, clean the MAF sensor, replace any loose or cracked vacuum lines, PCV valve, new air filter, new battery.

99% of the time all you should ever need for a tune up is new spark plugs, and a clean air filter and throttle body. But since your inquiry indicated "major" I gave it more critical thought.

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Clean the throttle plate-CRC Throttle Body Cleaner
Clean the MAF Sensor--CRC MAF Cleaner

Have the O2 Sensors tested

If it is 10 years old, the exhaust
converter may be plugged,that's
not good and shouldn't happen

Check for vacuum leaks
A leak causes the O2 Sensors to add fuel,
to account for extra air

Make sure the air filter box and ALL
Ducting to throttle is air tight

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Excessive cranking before it starts sometimes


Check fuel pressure at the rail

Surely, you have changed spark plugs at 60,000 miles
Air Filter and Gas Filter every 3 years
Cleaned Throttle Plate and MAF Sensor

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1 Answer

When my vehicle is running and I stop at the light or if i'm parked with the vehicle running, the engine seems like its about to shut off. what oculd this be?


About 12 things

Clean the Throttle Body with --CRC Throttle Body Cleaner
Clean MAF Sensor with -CRC MAF Cleaner
Need a fairly clean Air Filter
No Vacuum Leaks --anywhere ( including ducting-- filter to throttle)
Common sense--Spark Plugs,every three years,not more than 50,000 miles
--Gas Filter,every three years,30,000 miles
Check --for loose O2 Sensors (Vacuum Leaks)
Check--TPS Sensor,at idle

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