bigshrimpin

Mitch - I think the truck will go with me to Florida in the Winter, so I can avoid the snow/salt in MA. No more wife . . . so I can do whatever I want now :)

Mileage was 12 - 14 depending on hills. Boat, motor, and trailer weigh just over 3500lbs.

Just finished towing my boat 3466 miles Cross Country!! . . . CA to MA. The truck handled like a champ!! Under 4 days at 55 - 60mph.

Mitch - start with the free stuff . . . Cleaning the throttle body, check vacuum lines, read the codes, etc. I think the real problem besides the dirty fuel was the injectors and the vacuum leaks. Honestly they were simple to swap out . . . and I paid $50 for 8 rebuilt ones.

Yup . . . that's how I was reading them.

Doh - I'm an idiot :) Turns out that I accidentally dropped two of the spark plugs before I put them back in for the last time. I didn't notice . . . but it must have landed arse end down . . . there was no gap at all on plug #1. regapped the plug back to .35 . . . no more code 14????? The truck purrs like a kitten!!! with the new design III ford injectors, cap, rotor, o2 sensor, and total fuel system douche. I step on the gas and I can light up the tires . . . wohoooo!! Thanks everyone for all your help . . . I learned a ton working through this "problem". **************************************************** Mitch - I had multiple problems going on with the truck. Dirty Throttle body, Vacuum Leaks everywhere, Dirty Injectors, Torn filter bag (in fuel tank), old cap and rotor, old plugs.

Doh - I'm an idiot :) Turns out that I accidentally dropped two of the spark plugs before I put them back in for the last time. I didn't notice . . . but it must have landed arse end down . . . there was no gap at all on plug #1. regapped the plug back to .35 . . . no more code 14????? The truck purrs like a kitten!!! with the new injectors, cap, rotor, o2 sensor, and total douche of the fuel system. I step on the gas and I can light up the tires . . . wohoooo!! Thanks everyone for all your help . . . I learned a ton working through this "problem".

Thanks for that reply. Here's my confusion . . . cause the voltage checks out according to my multimeter but it still throws error code 14 right away (after I reset the battery). Hmmmmm . . . ******************************************************** What does it do? Compares ambient barometric pressure during start-up (cranking) to engine load while engine is running. The ECU computes that information and adjusts the air-fuel mixture accordingly. ********************************************************* would engine load would be coolant temp sensor data??? what feeds the ecu barametric pressure?

All right I got there . . . 4.88 Volts ignition on. Engine started, warmed up at idle . . . output hovers at 1.66volts (down to 1.52 . . . up to 1.88). Is it safe to say now that the MAP sensor is behaving properly?

I think this is the last of my problems :) at least I sure hope it is. I'm getting an error . . . Code 14 about voltage being too low or high for the MAP sensor . . . does this mean the MAP sensor needs to be replaced or that some input signal to the MAP sensor is off? is there anyway to troubleshoot this problem without buying a new MAP sensor?

Just read how to get the codes . . . I'm getting code 14 . . Code 14-MAP voltage too high or too low Any ideas on how to fix?

Just installed the Design III injectors . . . What a difference clean injectors make . . . it runs like a scalded cat now.

From what I read on most sites . . . looks like Design II and Design III Bosch injectors are interchangeable and that the 19lb injectors will work well for the unmodified 4.0L HO jeeps. Thanks everyone for your help. http://www.lunghd.com/Tech_Articles/Fue ... grades.htm http://www.fiveomotorsport.com/Injector_SetsJEEP.asp Got a set of 8 for under $100. Hopefully this does the trick.

THanks Lead!! That helps a LOT!! I found this too while searching. http://forums.off-road.com/jeep-mid-siz ... ngine.html

I don't really know what I'm talking about . . . but I did some searching on this site and around online . . . Both appear to be 19# bosch injectors for ford . . . design II or design III. The HO injector spec is 22lb??, but there was talk about 19# injectors running better in 4.0L motors?? I'm just trying to make head of tails of this before I drop more money on the truck. If I can save $40+ and get them locally . . . it's worth a post.

Guys - I'm looking into my options for 6 new injectors. There is a deal on the Design II injectors in the classifieds for around $100 for 6 rebuild Bosch 19# injectors, but I know of a set of 8 brand new design III 19# injectors that are for sale locally for $60. I read somewhere that "livesignal" replaced his injectors on an 88 comanche with Design III type with good sucess . . . Anyone know if these will work with a HO 4.0L? http://www.comancheclub.com/forums/view ... ors+design

Doh - not the o2 sensor. Just bought one and still have the same issue. Time to throw some more money at this one.

I let the truck sit for 20 minutes started it again. Almost 1 minute idle (without any misses) and then it started to miss again and idle rough. Could this be the o2 sensor? or something else? I'm stumped . . . haven't touched the injectors yet.

I think it has 4 wires . . . it's a bosch 15704 BTW - Thank you everyone for your help!!

It's all back together now with the new mesh bag filter. I have a factory manual and looked at the Hynes manual in the store. I didn't see anything in there specifically about cleaning an injector. I'm probably making too much of a deal out out of a simple task. The engine starts and idles better. I pulled the o2 sensor today and cleaned the throttle body. It was really gunked up. I started the motor with the o2 sensor out and it idled pretty well for about 1 minute and then seemed to start missing again. No vacuum or fuel leaks anywhere that I can see. Is it normal for the o2 sensor to get hot . . . when removed from the exhaust mainfold? when I ran the car . . . it got pretty hot just dangling down by itself

I'm almost 100% sure I know which station I got the bad fuel from . . . Anyways . . . I still have to figure out this mess. I think the prime suspect is the injectors. I've never taken them out . . . . should I just visit the bone yard and pull a set out of a 92 or newer jeep . . . or can you disassemble and clean these things. I saw the deal on the Design II rebuilt ford injectors . . . maybe I should just plan on replacing them???

Doh!! I drained and dropped the tank . . . Fuel was clean!!! Tank was spotless inside. The mesh bag like filter on the end of the pump was split open. Otherwise it all looks clean as can be inside the tank. I guess that it must be the injectors or some sensor that I'm over looking.

My comanche started running like crap last week. At first I though it was spark plugs . . . because I hadn't done cap, wires, plugs in about 2 years. So I swapped out the cap, rotor, and plugs and it still ran horrilby. So today I change the fuel filter. There was so much dirt in the fuel it looked like chocolate milk. I had just changed the fuel filter a few weeks earlier when I changed the air filter, so I have no idea where/when in the last few weeks . . . I picked up all the garbage in the tank. There's at least 18 gallons of fuel in the tank now . . . what's the easiest way to drain the tank. I don't know if it's important, but it's a 1992 2wd 4.0L. and it's missing badly . . . is it worth going though the injectors too?

Thought I'd just post a pic of the Comanche Tow Rig. Helper Springs have made a world of difference when towing . . . but they are really harsh without the trailer tongue weight.

Please send me a copy too . . . I'm shopping for new shocks this week. wtbarber@yahoo.com