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Old 08-01-2013, 12:22 AM   #1
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Blown Engine?

Recently I have done some work to my 91 wrangler 4.0.

New radiator,
Brute force cold air intake,
spark plugs
ignition wires
fuel filter
both throttle body sensors.

Here's my dilemma.

After installing my CAI system, the proper way, it ran for about five minutes. the influx of air caused my already gunked up air/fuel sensor to go so I replaced them and sprayed a little starter fluid into the spark plugs and got the jeep running because I couldn't just start it the regular way, ran fine for a day. (driven at night).

Last night I ran it HARD and I didn't have any issues. Throttle response was fantastic, sounded like it was breathing great and had no issues at all. Just two hours ago I took it out for a small ride around the block and it seems everything is happening again.. I haven't done anything to it since last night driving or even starting it wise.

Signs and symptoms....

Mainly started after driving for a few minutes..Both time the jeep started to sound like a helicopter and chugging air bogging down my engine. I'd let off the gas and let it try to catch itself but no. It died trying to make it back home, can't even get it to idle anymore or even start... My starter, battery, and all other key items to get it running seems to be just fine..

I let my TB soak in acetone and clean all the gunk out and replaced the sensors, that's what fixed it the first time..

I did have to spray some starter fluid into the spark plugs to get it to start but I didn't think anything of it, just that it needed a little help.

I thought it was the CAI with the massive cone that it has but I reinstalled the stock intake and it didn't make any difference at all.

I've researched cracked exhaust manifolds, blown engines, bad timing belts but I really can't get a good feel on what to do or where to really start looking.

I've looked around but haven't really noticed anything significant.

I haven't attempted to start it again cause I don't want to damage anything more than it may be already..

I am kind of thinking fuel related but I really have no clue

Any ideas?

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Old 08-01-2013, 12:23 AM   #2
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Also, my profile may say that I'm a newb but I have pretty good skill in rebuilding my jeep. I'm just not the greatest at trouble shooting engine issues.

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Old 08-01-2013, 02:22 AM   #3
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You should do a compression test first.
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Old 08-01-2013, 07:43 AM   #4
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OK here's something for consideration. From your description it seems like this condition could have originated with your CAI upgrade which deals with increasing air flow. Talk to me about the rest of the exhaust system specifically the age and condition of the cat that's on your Cali ride. On other threads Im reading a bunch of YJ owners with difficulties resulting when these things start to go. I agree with doing a compression test to check the engine itself but wanted to throw this thought into the mix.
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Old 08-01-2013, 09:10 AM   #5
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Funny actually cause I was reading all kinds of post from you last night in regards to heated floorboards from a bad CAT.. My Jeep is registered in Florida and I'm considering making straight pipes to ease the pain...

My exhaust system is stock, beaten and dented, but I fixed and tac welded a few parts to keep it alive.. It's old as hell and wouldn't surprise me if my cat was bad. Just never knew a bad cat would cause so many issues. It doesn't sound like a cracked header but it does sound like it's having a hard time breathing or releasing.
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Old 08-01-2013, 09:29 AM   #6
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I am realizing through my personal experience and then hearing from other forum members that problems resulting from cat failure are common in these 25 year old +/- rides. Because it's an insidious problem that slowly creeps up over time sometimes owners just write it off as one of the 'joys' that goes along with driving an older vehicle. The bottom line is they have to breath and the better they breath the better they run. Removing or replacing the cat can not do anything but improve the ride. I'm totally convinced.
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Old 08-01-2013, 09:30 AM   #7
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not saying that is your problem but I have seen cats so clogged that the engine would not run
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Old 08-01-2013, 09:37 AM   #8
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Quote:
Originally Posted by harleydragon View Post
not saying that is your problem but I have seen cats so clogged that the engine would not run
I also don't know if this is the problem here but I once owned a corvette which I thought I had blown the transmission because no matter how much gas I gave it the damn thing barely moved forward. Clogged cat
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Old 08-01-2013, 09:43 AM   #9
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Mhm, what the hell I wanted a new exhaust anyways, might as well take it off and see.. It'll sound like shit but i may just take it off at the header and see if it runs that way until I find out what kind of exhaust I want to get.
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Old 08-01-2013, 09:46 AM   #10
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I do quite a bit of offroading, do you think it's worth the loss of low end torque by going straight pipes or should I actually get the cat back system? Want to relatively stay cheap, I want it to breathe but nothing fancy.

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