[Steve91T]

I'm mostly kidding but here's why I ask. My dad noticed his 335d was a little sluggish. He put some Lucas fuel injector cleaner in it and it made a noticeable difference. My E36 M3 has 210,000 miles on it and for a while now it ran like crap until fully warmed up. It would drop a cylinder or something, but since it ran like a champ when at operating temp, it didn't bother me very much. Anyway, after only 40 miles with Lucas in the tank, it doesn't do it anymore. Same with my boat and even my 7.3 Powerstroke is running better.

So my 97 SS has a junkyard LT1 in it. It only has 116,000 miles on it but it's been sitting for years. I recently got the car on the road. It has great oil pressure, doesn't smoke, but runs very rough. The fuel injector cleaner is helping but I think there's a compression problem. Is there anything on the shelves that can help with that? I know there are products that say they can, but anything that actually works like the fuel injector cleaner? My goals for this engine is to do a few track days with it and sometime next year swap an LS1 into it. I just need to get by for about a year or so. I only paid $380 for engine so I'm not too worried about it.

[dailydriver]

CRC came up with a product just for the DI intake valve problems.

You spray it into a sealed system (ALL intake hoses attached and sealed) with a straw, while the engine is running.

I don't know how effective it is since it was just released last year.

[mr.beachcomber]

CRC came up with a product just for the DI intake valve problems.

You spray it into a sealed system (ALL intake hoses attached and sealed) with a straw, while the engine is running.

I don't know how effective it is since it was just released last year.

The CRC Intake Valve Cleaner is very effective at cleaning accumulated carbon off intake valves and piston tops! I used it on a TPI engine with 100K+ miles with worn rings. I blocked off the PCV clean air port on the throttle body, cut a hole for the application straw, and then followed the directions on the product. (Essentially 2000 RPM while spraying the contents into the engine, chill the engine for 20 minutes, and then drive at Interstate speeds for 10-20 miles to clean out the remaining crud.)

I did just before an oil change because I didn't want the product slipping past the worn rings in my everyday oil (0W-40 Mobil 1). After changing the oil, I removed spark plugs #1,3,5, and 7 to take a look with a friend's bore scope. All the intake valves and piston tops were relatively clean compared to their previous state! Plus I immediately noticed better seat of the pants acceleration. Still have the worn rings, but saving up to do the engine rebuild in another 50K miles.