Fuel Injector / Throttle Body Service
 

Is this worth doing at 32k miles? My gas mileage seems to be low and the dealer suggested servicing the throttle body and injectors.

Does that sound right?

Cost at the dealer is $250.00.

Re: Fuel Injector / Throttle Body Service
 

i got a fuel induction service at 46437 miles for $132 at my dealer.
3 step service
1st step helps remove upper engine deposits
2nd step cleans throttle body/air intake area
3rd step fuel additive added to fuel to clean injectors

it ran rough after the service, i took it back and they said it was ok, i took it home and found the maf sensor had all kinds of crap on it, i cleaned it and the h2 ran smooth after that.

as for your h2 at 32k miles, clean the maf sensor, and run 2 cans of seafoam per fill up for 2 fill up's and see how she runs. it should not need a service unless your running crap gas.

Re: Fuel Injector / Throttle Body Service
 

Thanks.

I always run Chevron or 76 when in a pinch.

Did you notice an improvement in gas mileage?

Re: Fuel Injector / Throttle Body Service
 

Mafs are very sensitive and I've found spraying helps, but replacing them is the only solution if they are acting up. You definitely don't want to physically touch any sensing part of the maf - just spray it.

Re: Fuel Injector / Throttle Body Service
 

If memory serves me the maf should be sprayed with electrical parts cleaner correct?

There's no codes and the truck idles fine the gas mileage just seems to be a little low.

Re: Fuel Injector / Throttle Body Service
 

CRC makes an actual MAF Cleaner, just spray and let air dry.

Re: Fuel Injector / Throttle Body Service
 

Make sure the igfnition is off and you allow the maf sensor to cool fo at least 15 minutes or you can damage it by rapidly cooling the sensors

Re: Fuel Injector / Throttle Body Service
 

Thanks all.

I'm going to order the stuff suggested and give it a go.

Re: Fuel Injector / Throttle Body Service
 

it made the h2 run smoother, 1mpg regain back to around 13mpg from 12mpg.
i did it as a preventive service since i was close to the 50k mark.
i also use crc maf cleaner every time i clean the air filter every 3 months.
cleaning the maf sensor really helps with keeping the h2 running nice and keeping the mpg's up

Re: Fuel Injector / Throttle Body Service
 

12-13 MPG??

Is that all highway driving? I'm lucky to get 9 in the city. IF my wife drives it she gets 12 on 50 mile HWY trip.

Re: Fuel Injector / Throttle Body Service
 

13mpg average mixed mpg, i reset the miles and divide by gallons fueled at station at every fuel up. im thinking of regearing to 4.88's, i think i can pick up 1 more mpg.

Re: Fuel Injector / Throttle Body Service
 

Um lower gear ratio=higher rpm=less fuel mileage

Re: Fuel Injector / Throttle Body Service
 

i thought the handheld tuner would correct the higher rpm's issue.
i also thought the 4.88's would make the engine work less.
i can see the higher rpm's without the tuner.:confused:

Re: Fuel Injector / Throttle Body Service
 

The tuner will correct the speedometer with the lower gears, but does nothing for engine rpm vs ground speed ratio. The lower gearing means the engine has to spin faster to make the axles turn the same speed they did with the higher gearing. That is what makes the moter have to "work less." Imagine a mountain bike. When you have it in an "easy" gear it is really easy to pedal but you don't go very fast. This is low gearing. Now if you put it in a "hard" gear, you pedal slower but you go faster. This is a high gear. You are experiencing the same effect that your engine will feel if you go to lower gears. To go the same speed as you did not a high gear you would have to pedal like crazy, and would become exhausted, or use more fuel.

Re: Fuel Injector / Throttle Body Service
 

Cleaned the MAF sensor and running the first tank of SF through it now.

What a difference cleaning the MAF sensor makes!

Thanks guys!!

Re: Fuel Injector / Throttle Body Service
 

I was going to suggest cleaning out the throttle body by hand (you clean the "ring" of deposit left from where the plate closes) and getting some good fuel injection cleaner in your tank.

At your mileage, I think it would be a waste to spend 250 (which is ridiculous btw) on your truck.




That's not always true... If you put a set of 37's on an H2, you're effectively changing the gear ratio from 4.11's (stock) to say 3.23's (for sake of discussion)

Technically you'd be lowering the rpm and based on your higher rpm=less fuel logic, a driver should expect better gas mileage.

All of this is within reason. Anyone doing so will see a decrease of mileage of 2-3 mpg simply because the engine had to lug harder to pull the truck around. Turning over heavier, larger diameter tires will hurt gas mileage out of the hole and on the highway.

Where you may see an increase it cruising at about 45 in the city. (providing you're not stopping and going)

Just sayin'


Mark

Re: Fuel Injector / Throttle Body Service
 

Cleaning the Throttle Body is the only time I wish the hood opened up vs fwd. :soapbox:

Re: Fuel Injector / Throttle Body Service
 

Would it be worth it to clean the throttle body?

If so what to use? My buddy was saying some throttle bodies have a Teflon coating that shouldn't be touched.

Re: Fuel Injector / Throttle Body Service
 

you should be running 2 cans of sea foam with a full tank,
if you read the can 1oz does 1 gallon,
since a can has 16oz you should use 2 cans, that's what i do.
btw i went to pepboys yesterday and they have a special buy 2 cans of sea foam and get one free instore.
that's $6.67 each can.

Re: Fuel Injector / Throttle Body Service
 

The same company that makes the MAF cleaner,CRC makes a throttle body cleaner. I use a toothbrush and give it a good scrubbing. I think the teflon ones you reffered to are on Fords.



I'm tempted to try this SEAFOAM, Does it smoke the whole tank full or just in the beginning, also any worries with this, I just ran a fuel injection cleaner not that long ago. I think someone mentioned having your oil changed after doing a seafoam cycle.

Re: Fuel Injector / Throttle Body Service
 

I put in 2 cans. :) It was on sale for the same price at my local parts store also.

YETTI-

It doesn't smoke at all when added to fuel. Only when you suck in the manifold with a vacuum line.

You can also add it to your oil a day or two before you change it.

NOt sure if you'd be doing things backwards if you cleaned your injectors/fuel system first and then added it the oil before an oil change.....

Re: Fuel Injector / Throttle Body Service
 

I am interested in cleaning the MAF and, throttle body , but I don't have a clue on where it is (Is it near the air filter)?or how to do it. Would anyone be interested in explaining that or if there is a diagram? I currently don't have the Helm manual.
Thanks

Re: Fuel Injector / Throttle Body Service
 

The throttle body is mounted on the intake manifold on top of the engine. First find your air filter housing, which will be a large black plastic box mouted to the inside of the right fender. You will see a black plastic tube that goes from the air box to the engine and connects to the throttle body. I am not certain as I have not messed with the one on my H2 yet, but the MAF should be located somewhere in between the air box and the throttle body. Sometimes they are near the filter and sometimes they are closer to the throttle body. It is pretty seasy to get to them though. Shouldn't need much more than a screwdriver.

Re: Fuel Injector / Throttle Body Service
 

Thank you for the fast reply. :beerchug: I will work on that this weekend.
Scott

Re: Fuel Injector / Throttle Body Service
 

Do both at the same time.

Pick up a bottle of CRC MAF cleaner and a bottle of CRC Throttle body/intake cleaner.
grab a toothbrush.

I'd start off with disconnecting the negative battery terminal.
then loosen the three hose clamps with a flathead screwdriver. 2 at the MAF sensor and one where the intake tubing connects to the throttle body.
Unplug the harness going to the MAF sensor. wiggle that sucker loose. Be careful though. Once out don't even think about touching the inside of the MAF with anything. Just spray the heck out of it. set aside and let dry while you do the throttle body.
The throttle body I would spray and scrub(toothbrush) around butterfly, also lift the butterfly and scrub inside.
Put everything back together and start engine. It will start a little rough at first or have trouble starting but it will start.

There's a couple of great videos on youtube incase your second guessing it. They're not for the H2, but chevy's so close enough.

Not sure if I missed anything, If I did someone might chime in.

Re: Fuel Injector / Throttle Body Service
 

I agree 100%! What a PITA!

Cleaned the MAF and scrubbed the throttle body with the CRC products. Replaced my K&N filter and dumped some Sea Foam in the tank and oil...

...all I have to say is, "zoom zoom!"