This Just In..

[ford_munky_man]

My Bronco only is a 6 cylinder! :( Well for real it is an 8 but it isn't firing, or firing and not working and cylinders 7 and 4. We think we eliminated it down to a vacuum leak in the runners between the two cylinders. Lately, after sunday, it has been running really crappy and when I punch it it literally does nothing and slowly accelerates (it takes me atleast 3 blocks to get to 30mph) or it'll jump and go for like 2 seconds than shift up to a higher gear (atleast that what it seems like to me). It was acting fine on Sunday when I went out wheeling but monday morning it did all this. We checked multiple things in shop. We checked proportioning valve, blocked of EGR, corrected the timing, adjusted the jets on the carb, checked firing order, then finally hooked it to an oscilloscope and figured that two of the cylinders contribute nothing. Then we decided it may be a vacuum leak since that is the only thing that the two have in common. Tomorrow we are compression testing them to make sure, but he says I may need to line out some intake gaskets, but I may just wait till next week cause then I will be (hopefully) doing a FI swap and I'll just take it off then instead of doing it twice. But any other ideas that it may be from? Just from any personal experience?

[PaleBlue90]

do you have spark on those cylinders? hows compression? did you check the plug wires? the cap?

[ford_munky_man]

Spark is good on all both of them yes we did check plug and caps. Today we will be compression checking them. When we had it hooked up to the scope all the spark signals were the same and looked good. Except for when we killed the cylinders one by one the 3rd (cylinder 7) and the 7th (cylinder 4) didn't conbtribute anything.

[Hefty]

:laughing3:Man when I first started reading your post I though, Aren't you a mechanic, shouldn't you know the difference between an 8cyl and 6cyl engine

[ford_munky_man]

Lol ya well compression test showed 90 1st puff and 120 on both so they both are good. So pretty much ruled it to intake gaskets. Should be fixed within the next week or so.

[PaleBlue90]

any idea on what it is?

[bronc_17113]

your not from the south so why dixie

[ford_munky_man]

Intake Gaskets. I will be throwing some new ones on this next week. If that doesn't cure it then we havce something a little more serious than originally expected.

[ford_munky_man]

Ok, so new plan. I may have mentioned this in the FI swap post, but today after I get off I am heading up to good ol' Billings MT to get a donor 93 Bronco w/ a 302 and an either E4od or AOD, not quite sure. It runs and everything so shouldn't have problem there. Just going to swap the whole tranny and engine in to mine. BTW I am going halfsies on this with a friend. He is getting the body and everything and is giong to stuff a 460 under the hood. So total it is $800 but I am only paying $400 for the engine, tranny and t-case. Pretty cool I think, So within the next two weeks or so I will have a EFI 302. In the mean time I am going to do a rebuild of the 351 and beef that and the tranny (maybe) up and when the 302 gets tired either stuff that back in w/ FI system or find something else to stuff it into. :thumbsup:

[bronc_17113]

why would u get rid of the c6 for a weaker tranny

[ford_munky_man]

Well the tranny isn't all the way thought through yet. My thinking is that if it is electronic or something that the one paired to the 302 may work better, and if it has od then it'll net me a few more mpg's. And since this is my dd then mpg is a big goal right now. But I have access to 3 shops and a multitude of tools and knowledge so I will probably be doing some experimenting in the next few weeks/months.