Description
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GM Upper Engine and Fuel Injector Cleaner is a low VOC compliant formulation that delivers immediate engine deposit cleaning. This product has multiple service applications including in-rail fuel injector cleaning, engine intake system deposit removal, and piston top soaking clean-up.
Vehicle information
Available fitment details
Listing compatibility notes
- About this item Some ACDelco Gold parts may have formerly appeared as ACDelco Professional Premium aftermarket replacement part Manufactured to meet specifications for fit, form, and function for General Motors vehicles as well as most makes and models GM Upper Engine and Fuel Injector Cleaner is a low VOC compliant formulation that delivers immediate engine deposit cleaning.
Fitment data is provided as a buying aid. Verify the listing against your vehicle and existing part before ordering.
Repair scenarios, installation, companion parts, and use outcomes
Buying guidance
Quick decision
Review this fuel system cleaners in the context of the repair and the surrounding components.
Repair scenario
- Identify the symptom and confirm that this is the component required by the repair.
- Inspect nearby connectors, fasteners, and mating surfaces before installation.
Installation notes
- Use the listing instructions when present and follow the vehicle service procedure.
- Professional installation may be appropriate when the repair requires special tools or calibration.
Companion parts
- Inspect nearby fasteners, connectors, seals, fluids, and wear items before starting the repair.
- Use the service procedure and the visible package contents to identify any additional parts or tools required.
Before you buy
- Compare the listing title, photos, package contents, and specifications with the part being replaced.
- Confirm vehicle compatibility and installation requirements before ordering.
Customer feedback
Ratings and written reviews
4.7 / 5
229 source ratings
Source: Amazon. Imported marketplace feedback is shown for product research and is not a review of a purchase made on this website.
Mrs. G –
I have a 98 Saturn SL2 that went a long time with a stuck open thermostat valve. I believe this led to rapid sludge and carbon deposits in the cylinder head and piston rings that caused oil consumption to become severe. At its worst, the car was consistently consuming a full quart of oil with each tank of fuel.I added 2 oz. of this product to each cold cylinder and soaked overnight. The remaining thick black solution was expelled by cranking the engine over several times with the spark plugs removed. I reinstalled the same plugs and wires (still fairly new) and drove the car hard to expel all the solvent and loose deposits. Yes, there was a smoke show. I then changed the oil.After driving more than 200 miles, the oil consumption was observed at roughly 1/2″ on the dip stick – which is at least half the oil consumption I’ve come to expect. Furthermore, the fuel economy was measured at 31.5 mpg over my regular commute that saw between 29.5 and 30.0 mpg during the last three years. I also perceive the engine is quieter, shows a bit more power, and has a rock solid stable idle after warm up. Previously, the idle was more erratic.ADDENDUM: I have a better assessment of performance after six weeks. The average fuel economy has been well over 31 mpg with one cycle showing over 32 mpg. The mpg gains are real. More important, the car consumed between 3 and 4 quarts during this period – roughly half the rate of oil consumption before the treatment. So, the reduced oil consumption is real.
Sam Chesnut –
This stuff is great. Mixed the whole bottle with 1/2 gallon of diesel and idled the engine until the mixture was used up. Before I ran this through, cylinder #4 was at 14% and there was a heavy visible smoke from the exhaust. Since I ran the the mixture through, I’ve put several tanks of fuel through the engine and the issue hasn’t returned yet. All of the balance rates are +/- 1.5 still. You will need 4 feet of 1/2″ and 3/8″ fuel line and a hose clamp for each. Also, an inexpensive fuel line release tool is needed. It’s worth a shot!
R. Widebrook –
Heard about this in forums, as being superior to other top engine treatments. Used it as an overnight top-piston soak, plus as aspirated via vacuum into the intake manifold with engine running. Although initially the post-treatment cylinder compression read 4% lower at first, the engine ran smoother and more quietly, peppier, and the engine monitor readout of mileage went up by 10%. Thus, good signs of effective carbon cleanout. In time, I’ll reevaluate the compression and mileage results. Although this is pricier than similar products, it appears to work quite effectively. I’ll carry on to keep carbon minimized, such as with use of Top Tier gasolines and synthetic oil.
Scotti –
I’ve been trying to clean these pistons with brake cleaner, carb cleaner, sea foam, and several other cleaners nothing really worked at all then I took a chance on this and wow did it work great. I poured a small amount onto a paper towel and coated the piston as I did this I could see it start to run off right away gave it a few seconds and bam it wiped off like a nonstick skillet with just a paper towel crazy. I had 2 pistons in the back that were really bad and I had to let it sit on them for a minute or two but bam came clean if you need to clean carbon build up and stains on pistons or engine parts this is worth every penny turned a 2-3 hr cleaning job into a 15 minute job. Don’t hesitate just buy it.
Rich, L –
Used this cleaner for a top end soak overnight to clean carbon off piston rings of a 04 accord that was consuming oil. It worked perfectly after using the eng starter to pump most of it out no more oil consumption. Note your engine will smoke considerably until all of the remaining cleaner is burned up. No check engine light was set off. Highly recommend as an option, also check pvc system to make sure it’s functional. Use at your own risk it worked for me may not for you.
CLTypeSlow –
Use this for multiple purposes like cleaning motor parts and doing piston ring soaks. Frees up stuck rings reducing oil consumption and increasing compression. Great stuff
Michael Pence –
Great cleaner
Bridie R –
Did a compression test before adding this to the cylinders and letting it sit overnight. Then blew it out, burned any remaining off by letting car run for 15 minutes, than did an after compression test. The before test had cylinders between 125-140, after, all 6 cylinders were right around 170.