I have a 2007 4.6l 2 wheel drive with 200 thousand miles just the groove I went from 12 mpg to 15.then did the pcv reroute and am up to 17 mpg city now.thanks to Ron for help.I'm still gonna wrap the exaust.I'm just checking each time after a modification to see the difference.
There is more you can do for mileage gains from this truck, and a grooved TB makes for top mileage in conjunction with other things, as you learned from doing the PCV reroute.
These are simple maintenance-type things which will all help increase your engine efficiency, which has an effect on mileage. If you really want to dig in, you could look at sensor correction/modification next. These trucks should easily do 20mpg or more.
For your consideration/attention:
- clean your MAF sensor. The internal wires get glazed up over time and stop measuring the air correctly (especially important if an oiled air filter is or was used)
- Check your EGR system for proper functioning. An open EGR valve is a large vacuum leak. (If that valve is carboned up, it may not close completely) (Wrapping exhaust will help this system work better too)
- RVS treatment of the engine (add transmission and differential for bonus points)(then switch to synthetic oils)
- open up the spark plug gap and/or switch to resistorless plugs
I was also alluding to putting an EFIE circuit on the o2 sensor(s), and possibly a MAP sensor modifier.
The EFIE helps you take better control of fuel delivery - with the groove helping to make sure all the fuel burns in the engine, some computers need help realizing that the increased oxygen in exhaust is normal, and stops it from trying to compensate with adding fuel.
The MAP sensor also plays a part in fuel delivery as far as the baseline is concerned. After the groove, it uses fuel better, but again the computer doesn’t know that it needs less to run. We can fix that too.
Grooving is a process towards efficiency. You can stop at any point, but why not go for the works?
The following user(s) said Thank You: Tracy Gallaway, Michael Lee
I heard that it's a lot of information to take in.yall are a big help to so many keep up the good work.im going to do the rvs treatment also.it may take awhile for that process but I'll be back to share it.
Ok got my exhaust wrapped and second round of rvs in just 200 miles on it looking forward to results.also I put a new gasket between the throttle body and intake I will try to get some pictures on here.the gasket has weird shapes or slots to direct air I thought was strange.the new one also has them on it .I thought about cutting it off the old one so it would just be round. Relearning after disconnecting the battery keeps me busy.i just cant leave nothing alone.still getting around 17mpg city if I don't get any more I'm happy with the progress so far.
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