well im trying to find some answers to some problems iv been having lately with my 88 xj 4.0 4x4 auto trans 263k
it started with bad gas milage. like less than 200mi to the tank
and the exhaust smells like gas
however, the engine burns like a qt of oil every 200 mi or so
but today I was wheeling and it started black smoking like crazy, maybe it was blueish gray but it was 3 am so I couldn't tell haha
I use 10w-30
replaced o2 with a brand new one a month back
new egr
very smooth idle
im lost haha id appreciate any help with these problems guys!
thanks-adam

 

Is your oil getting thinned out by gasoline? What's it smell like? Is it thin and gassy smelling?

 

the oil definitely smells like gas...it has tiny bubble looking things on the dipstick as well...and when I put it on my fingers it didn't feel like it should have?im assuming this is terrible for my engine
what does this mean? how could it possibly get in there?

 

Injectors sticking open, bad MAP sensor......

Get that oil outta there quickly.

 

replaced map sensor 2 months ago.

should I go ahead and just upgrade with new injectors then?

 

Gotta start somewhere. The original injectors are a known issue for leaking externally. But, yours have done what they came here to do, eh?

Make sure the line to the MAP from the throttle body is PERFECT. It has to be removed to dl injectors anyway.

 

yeah they haven't leaked at all
how do you feel about junkyard neon injectors? I had no idea they were so expensive new

 

I sold my 703's "Neon", after I picked up one MPG with Boch# 280 155 746 (Guess they come from Volvo's) It's been months and I haven't had a reason to do a "road trip" and test highway mileage. I just bump around slow. Anyway, here's a sort of rambling thread ....
https://www.cherokeeforum.com/f2/199...r-swap-163105/

 

Rebuilts are available on ebay. Check with Programbo here on CF first.

 

just ordered the 746's!
will report back!
thanks guys

 

Could you please go ahead and post up here, so we all can keep track? (or me at least!)

https://www.cherokeeforum.com/f2/1990...r-swap-163105/

 

done

 

If you do this test when you pull the old, you can see for sure. Heck, any that are not leaking anywhere you might even sell! Even though the stock are crap, some people like to stay stock.

Here I'm testing my old 703's which I sold. Also, they sprayed an even pattern. (I guess 703 is **** for 91 on.)

 

nice! i may just clean then up and sell them cause they dont leak a drop!
the ones i bought are used and i got them for 30$ so i should clean them up and make sure they work
what do you use to clean them?

 

I'm not much help cleaning them. I don't even know how to take them apart! I forget what I had on hand when I rinsed some...starting fluid or electrical contact cleaner maybe. I used a 9v battery to hear them click and hold them open to squirt through. Of course sparks and spray (anything) is dangerous. There is stuff on Google and U-Tube that's better than anything I have.