What to expect after replacing injectors and cups?

I have a 2013 Volvo 780 with the D13 and Ishift. Symptoms I experienced were shaking when going up any kind of incline pulling even an empty trailer.The shaking would stop if I let off the accelerator. Seemed to be worse according to the load that I had on the truck/engine. Bobtail could barely feel anything different. Had hard starts, that worsened where the truck when it would start would stumble a couple seconds before smoothing out on idle. Other than this, could not tell just by idle anything was even wrong. The kickdown on accelerator pedal to make trans downshift on its own didn't work, had piss poor fuel mileage which got down to like 6.3 pulling a 53 foot trailer with a 7000 lb load in the box. Only way I was sure I had a fuel issue was looking inside the driver side tank and seeing the air bubbles coming into the tank from the fuel return line. The truck is set at 455hp, but has not felt like it at all. Felt more like 300hp. There were also never any codes for fuel related issues, or injectors at all that ever come up on the dash.

Question is, will all this improve after dropping the $6,300.00 to replace the cups and injectors?

 

Well picked up the truck after repairs were done. Everything seemed to work itself out except the kickdown on the pedal to make the trans downshift. No more shaking, no stumbling, starts in maybe 2 seconds of cranking, idles a lot smoother (prob as good as a brand new one), and has power to go up hills. Felt like driving a new truck after this and all the other stuff I've had to replace.

 

I think I had a bad injector or something also. Shop didn't say any were bad, but I'd taken it in trying to tell them it was losing power. Idling and bobtail they couldn't tell anything. I could barely feel the shaking bobtail which they said was other stuff. Mainly because there wasn't any fault codes I guess is why they doubted it. The air in the fuel definitely affected performance for mine. I'm just glad I didn't have the nightmare I've read about some people having with fuel getting in the oil and chewing up the cam and rockers. Made more sense to me to replace the injectors with the cups. Supposedly cups were done just before I bought the truck. My mechanic said the cups they pulled were replaced, they were chrome not brass. So I guess maybe improper install by previous owner or whoever he used.

 

It was parts and labor. Volvo wanted almost $1000 more. The increase with Volvo was pretty much just labor. The shop I use is $107.85 per hour for labor. I will say now I kind of wish I would have went to Volvo, just because of the warranty. I don't even know what the warranty is on the parts if not installed by Volvo, but know my shop I went to they only warranty their workmanship for 6 months. I don't want to be doing this every year.

It amazed me how hard it was to start before getting it fixed. Sometimes would crank right up others would take 10-15 seconds. Doesn't sound like long, but cranking an angina for that long feels like you will burn the starter up before it fires off. I feel fortunate all around.

 

I can believe it. Mine sometimes if I barely pushed the accelerator seemed to accelerate quicker but was hit or miss really. Was no science to it. Sometimes would do okay but most of the time struggled and engine sounded like it was rumping usually driving at even highway speeds. Everyone thought I was crazy when they'd bobtail it and wouldn't notice anything.

 

Calibration maybe? If you didn't replace the injectors, I would think at least, that if they just went sticking injectors back in whatever hole they felt like they might have put them in the wrong ones.