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  1. Nick88

    Dual exhaust question.

    I get that back pressure is bad in any circumstance, I should’ve worded it better, I was more saying add them to almost simulate a 2.25 system with bigger pipe by using a smaller muffler by changing the flow rate in a way.
  2. Nick88

    Dual exhaust question.

    I want to completely get rid of the factory 2.25 Y pipe. I don’t want to spend a whole bunch to get a 2.5 inch kit, but I have a ton of left over 3 inch exhaust piping. My question is, with a 1988 TBI 350, I know 3 inch duals is massive massive overkill, but if I use some 2 1/4 inch mufflers I...
  3. Nick88

    Gas Mileage

    Very possible, and I really have no way to know, but my numbers are higher than the factory rated fuel economy specs, which many even call wishful thinking. It could be just worn parts fixing up making it run better and more efficient, which I don’t doubt, but the numbers are much better, so who...
  4. Nick88

    Gas Mileage

    Sorry the picture is small, I can’t really see, is there a hole burnt through causing a short? On mine, I noticed some black around the edge of the metal frame on the yellow, but I wiped it off and it hasn’t come back. I’ve read a lot of ACCEL horror stories, but also heard a lot of good, seems...
  5. Nick88

    Code 32 with a high flow exhaust.

    I’ll try disconnecting the egr, but I’m becoming much more suspicious of my o2, despite being a Delphi unit, I’ve noticed it acting funny, such as dropping out of closed loop once I stop, the engine kicks into o2 at idle when warming up a lot and starts bogging then kicks out and runs better...
  6. Nick88

    Gas Mileage

    I understand that a lot of it is bogus, hence why I quote that they “say” it will, most of it I doubt but it has worked for me, may not be all claimed benefits, but some work for me. I’m tracking fill up to fill up style, fill up at same station and track the mileage I go, not straying from...
  7. Nick88

    Gas Mileage

    I’m running cooper evolution m/ts they are pretty non aggressive mud terrains that are very quiet at max pressure. Quarter mod is when you slip a quarter in with the spring to up fuel pressure a few psi. Old mpg was around 15-16ish highway, city I’m not sure
  8. Nick88

    Gas Mileage

    It’s an auto 700r4, but with different gearing and tires it shifts pretty early, doesn’t see high rpm often so it helps with economy a lot
  9. Nick88

    Code 32 with a high flow exhaust.

    Very interesting, now I’m stumped, I was driving with the exhaust cutout fully shut today and it popped code 32 getting off the parkway when I was going around 40mph. What should be my next step? I verified solenoid operation, verified egr operation, and I verified the ports aren’t extremely...
  10. Nick88

    Code 32 with a high flow exhaust.

    Just put up a post on fuel economy
  11. Nick88

    Gas Mileage

    With these trucks, gas mileage is not a strong suit, although, fuel economy can be increased for relatively cheap and especially with the price of gas, will save you a lot of money. I did some mods to my truck which helped my 350 TBI in a 1988 square body Blazer get in the 20s cruising on the...
  12. Nick88

    Code 32 with a high flow exhaust.

    Yes once I start rolling it immediately kicks back into closed loop.
  13. Nick88

    Code 32 with a high flow exhaust.

    Forgot to update again yesterday, but I drove in field service mode with cutout shut. The fuel mixture was pretty much the exact same, but interestingly the truck still dropped out of closed loop immediately anytime Id stop, I'm not too concerned though as based off of the blinking of the SES in...
  14. Nick88

    Code 32 with a high flow exhaust.

    update- just took the parkway with cutout shut, much more peaceful quiet drive as everyone can probably imagine. More importantly I did not get a SES while holding it around 50-55 the whole time with almost no movement of the pedal. Obviously this isnt 100% conclusive as maybe somehow today it...
  15. Nick88

    Code 32 with a high flow exhaust.

    interesting feedback about my o2. I originally thought it was getting too cold, but the under 4mph reason may be more realistic. I think i forgot to mention but pretty much the same second I hit the gas out of the stop it kicks into closed loop. I guess we will see tomorrow afternoon with cutout...
  16. Nick88

    Code 32 with a high flow exhaust.

    Alright guys important update. I used field service mode and driving it was constantly perfect, equal between on and off flashes same duration. The only issue I noticed is after a second of sitting or going extremely slow, even after driving on the parkway, it immediately drops into open loop...
  17. Nick88

    Code 32 with a high flow exhaust.

    I understand it now fully after seeing the video and your graph. I’m very curious to see later how my motor is running while driving around / on parkway with field service mode. Agreed with the better efficiency with the price of gas. I can also make a post regarding how I have gotten such good...
  18. Nick88

    Code 32 with a high flow exhaust.

    I’ve used the field service mode to track going into closed loop, I know it can be used to read fuel mixture, but I never knew how, so I will be sure to watch that video once I get a chance. I got code 32 again today strangely while accelerating on a parkway ramp after sitting at 55mph for a...
  19. Nick88

    Code 32 with a high flow exhaust.

    I will probably end up doing the conversion, I’m just on a tight budget right now, so I’m gonna hold off for a bit, is there any benefit to the heated o2 besides just keeping it in CL for longer, does it read faster/ more accurate in any way?
  20. Nick88

    Code 32 with a high flow exhaust.

    Cut off the old catalytic converter when I bought the truck, I ran the truck without EGR a few times after shooting carb cleaner in the holes, massive vacuum leak from the intake side made truck run probably over 2k rpm, super loud. And exhaust side shot out carbon on my freshly painted engine...
  21. Nick88

    Code 32 with a high flow exhaust.

    It is still the single wire, but if I jump AB on the obd1 port it shows that it does in fact go into closed loop. I kept the restrictive factory y pipe for that reason to keep it being able to go into closed loop. I also know because the truck gets pretty good mileage and has great response to...
  22. Nick88

    Code 32 with a high flow exhaust.

    Very very helpful, later I will test at idle moving diaphragm to see if it is the exhaust passages clogged to hell. I have a cutout so I could shut it so all exhaust runs through my 3 chamber muffler, but I get noticeably worse mileage that way so I usually leave it open. If after all tests I...
  23. Nick88

    Code 32 with a high flow exhaust.

    I’m not too worried about more mpg, I just don’t want a SES to cause a drop in it. When going around 60mph in OD with 3.73 and 33s I can get low to mid 20s easily parkway. Driving half parkway half straight uphill crawling 15mph for 10+minute increments I got an average of 15 mpg overall. Not...
  24. Nick88

    Code 32 with a high flow exhaust.

    Do you know if code 32 would cause “limp mode” I don’t mind driving it around for a bit with an on and off SES before I pop the intake, unless it’s gonna drop my mileage and run like crap
  25. Nick88

    Code 32 with a high flow exhaust.

    Do you think it’s possible even though it obviously won’t be nearly as thorough, I could pop off the egr and spray a ton of carb cleaner in the exhaust side and let it almost soak in and loosen up the egr ports at the end of the intake. Just to save the hassle of removing everything on top of...

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