Right now, its a waiting game. I have had to drive to work. I haven't had time to check for the mist. So far it runs great, but still have the hesitation/sputtering issue. Which I have been dealing with for the past year, almost. Which I believe is related now. I would like to check the valves but just put on a new valve cover gasket. Its a rubber one, is it reusable?

I have not welded my exhaust manifold. I does have a small crack, just like any other cherokee. I have had it since the day I dropped the engine in. Which was three years ago. Have not had any problems with it until the past year.

I did talk to some guys I know and they suggested a leaking injector. Could that cause it? I did check for a leaking one months ago, by pulling the rail and setting it on cardboard. I don't think I left it there long enough. I think I waited for 15 mins.

This should be the link to my old thread of the hesitation/sputtering problem if anyone thinks it related.

https://www.cherokeeforum.com/f2/hes...-tired-109185/

 

Your valve cover gasket is reusable, you can pull the cover multiple times with the same gasket. I think only age and improper installation will ruin it.

 

It sure would run lean(hot) on the #1 cyl if it had trash in the injector or it was about to go bad. Try pulling injector harnesses one at a time. See if #1 makes less difference in the idle speed/smoothness than the others. Also, #1 lower injector O-ring could be bad causing a vac leak.

 

Thanks for the info. Sounds like I have booked weekend. Checking for mist, valve movement, dirty or leaking injectors and o rings. Haven't had time to check the #1 plug yet. Plan on doing it tomorrow night. So far it is idling great. But whatever I Can do to prevent another busted plug I will do.

 

A leaking injector would cause it to run rich - too much gas. Not a reason for detonation. Would also shows signs of carbon on the plug - it's too clean for that.

A plugged injector would make it run hot - lean - but your plug isn't melted - it's been hit - hammered - with an explosion - detonation.

Something is igniting it when it shouldn't. -- before the plug is supposed to ignite it.

 

Here is an update. Still having problems with it. I try to play with it when I have time. So today I have time. LOL. So I need some advice. I pulled the fuel rail to pull out all the injectors and replace all the o-rings. I pulled out the #1 injector and on the back side of it, it looks like someone put JB weld on the back of it. Can't explain it, don't know why. So I figure I need to replace. Yeah, they aren't cheap at the parts store. I have a fuel rail out of a 95, would the injectors out of the 95 work in my 90?

 

Injector pics.

 

???yea, maybe they might, I don't know for sure. Btw the stock injectors in your 90 are crap, and a fire hazard. Me, I guess I'd try to correctly read the numbers on the injectors in the 95 to be sure you know what you have.

some stuff here> http://www.jeep4.0performance.4mg.com/tech_specs.html

Well, NO! I see that even with the lower pressure the 95 uses a higher flow rate than your Renix. Must have to do with the puter'. I'm looking at the 19# Ford yellows for mine..my 703'3 are OK warmed up on the highway, but too rich cold, in open loop, is my thinking.

Can those stock injectors and get some 4 hole 18-19 lb/hr injectors. There are vendors here, also ebay, or find the right #'s and hit the JY. One guy had problems with the Airtex from Rockauto.

The gap in your photo in post #1 is too big. .035 is the gap.

 

Hey! I could USE those! We get Red Tale Perch here. With that I could cast out near the breakers!

 

Junk those injectors. Contact programbo on CF and he can supply you with a set of the correct upgrade injectors.

 

I would like to upgrade injectors but not in this 90. I would like to in my 94. But this 90 has wore me out this past year with trying to fix this problems it has. So if I find one cheap injector and it fixes the hesitation problem I'm probably going to sell it.

So the 95 injectors wont work. Even though the block and heads are out of a 95??

 

Get the correct one out of the scrapyard if you are going to sell it. The block and heads may be '95, but the control system is not.

 

First, Actually Me thinks they WILL work, even right when it's warm, but cold, and at heavy throttle they will dump extra fuel.

And...A guy posted an ebay link the other day, set of (8), EV1 connector, 19Lb/hr injectors, used, shipped for about $55. (I'm not fimiliar with issues with the leingth of the injectors though.

Don't know the condition of your 90, I'm getting close to 300K and mine runs great, but is defiantly ...falling apart! I've gotten some great deals on rigs people sold because they had to replace everything.

 

UPDATE: Some one donated injectors to me. CLeaned them, and replaced all the o-rings. So far no issues with the spark plugs. Runs really nice, and the trottle response is ten times better. I can almost burn off the right rear tire. HA. But I still have the problem with the hesitation at 60. I thought it went away but it still comes back ever now and then.

 

If you can tell a difference then we know ya fixed something with the injectors. What I am surprised of is IF you have detonation that bad as to crack a plug you should hear it. I mean it should be a rattle. I think it was just running lean on #1 from the injector. I mean look at the injector, its an obvious problem.