TBI or TPI?

[DamnJeep]

Here's a question for y'all.

As anyone who was at the valley crawl witnessed my TBI 305 ran like a crapped out carb when I tried to come on to the gas. Didn't like going from low RPM to WOT. Had to keep the revs up. Back fired etc. Very frustrating.

Anyway. I found a TPI 305 and was wondering if the extra complication with a TPI would get better throttle response as opposed to my tired old TBI?

[Creepy]

TBI's can work good. If the simplest, least wire, least sensor system isn't working for you, getting into something more complicated probably isn't the way to go.

There is def. something wrong with yours. I heard it, saw it happening. Sounded like timing.

Maybe rewire the TBI, re-familiarize yourself with the parts.
The sensors can all be tested.

You running EGR, or knock sensor?

[Hawkes]

Probably something small like a vacuum leak. You should have good throttle response with the TBI, I do.

[Cherokee Chief]

x2 on Jan's post.
it was too quick for a fuel issue, sounds like ignition issue.

[DamnJeep]

Sept 27, 2012 5:51:21 GMT -4 Cherokee Chief said:

x2 on Jan's post.
it was too quick for a fuel issue, sounds like ignition issue.

I agree. That's what I liked about the TBI set up. Way less wires and junk compared to my old ford 5.0 HO.

Never really thought about the ignition. Although I had replaced all the plugs and wires/cap last year I didn't replace the coil.

When I started looking into the TPI set up someone said you could have the best intake set up in the world but if the engine it's sitting on is garbage it won't make a difference. I can tell you the engine I have ain't the freshest thing in the world!

It may be time to find a "new" 350 instead of this tired old 305 and keep the TBI ;D

[geezer]

Rico,just get back to basics and check all the components.That tired old 350 will work great if you find out what's wrong.

[zukwatson]

i didnt see the buggy running at the crawl but coolant temp sensor is the most common run to rich, problem with tbi

[Creepy]

TBI required reading - www.binderplanet.com/forums/showthread.php?t=47254

Flip thru that, see if anything jumps out at you.

I'd resistance test the sensors. This link, has the sensor test values and links to more info. www.binderplanet.com/forums/showthread.php?t=45292

for instance - coolant temp for ECM
Coolant sensor approximate resistance specifications:
177 ohms @ 212 deg. F. or 100 deg. C.
241 ohms @ 194 deg. F. or 90 deg. C.
332 ohms @ 176 deg. F. or 80 deg. C.
467 ohms @ 158 deg. F. or 70 deg. C.
667 ohms @ 140 deg. F. or 60 deg. C.
973 ohms @ 122 deg. F. or 50 deg. C.
1188 ohms @ 113 deg. F. or45 deg. C.
1459 ohms @ 104 deg. F. or 40 deg. C.
1802 ohms @ 95 deg. F. or 35 deg. C.
2238 ohms @ 86 deg. F. or 30 deg. C.
2796 ohms @ 77 deg. F. or 25 deg. C.
3520 ohms @ 68 deg. F. or 20 deg. C.
4450 ohms @ 59 deg. F. or 15 deg. C.
5670 ohms @ 50 deg. F. or 10 deg. C.
7280 ohms @ 41 deg. F. or 5 deg. C.
9420 ohms @ 32 deg. F. or 0 deg. C.
12300 ohms @ 23 deg. F. or -5 deg. C.
16180 ohms @ 14 deg. F. or -10 deg. C.
21450 ohms @ 5 deg. F. or -15 deg. C.
28680 ohms @ -4 deg. F. or -20 deg. C.
52700 ohms @ -22 deg. F. or -30 deg. C.
100700 ohms @ -40 deg. F. or - 40 deg. C.

[KAC]

diesel...nuff said

[DamnJeep]

Sept 27, 2012 20:26:24 GMT -4 Creepy said:

TBI required reading - www.binderplanet.com/forums/showthread.php?t=47254

Flip thru that, see if anything jumps out at you.

I'd resistance test the sensors. This link, has the sensor test values and links to more info. www.binderplanet.com/forums/showthread.php?t=45292

for instance - coolant temp for ECM
Coolant sensor approximate resistance specifications:
177 ohms @ 212 deg. F. or 100 deg. C.
241 ohms @ 194 deg. F. or 90 deg. C.
332 ohms @ 176 deg. F. or 80 deg. C.
467 ohms @ 158 deg. F. or 70 deg. C.
667 ohms @ 140 deg. F. or 60 deg. C.
973 ohms @ 122 deg. F. or 50 deg. C.
1188 ohms @ 113 deg. F. or45 deg. C.
1459 ohms @ 104 deg. F. or 40 deg. C.
1802 ohms @ 95 deg. F. or 35 deg. C.
2238 ohms @ 86 deg. F. or 30 deg. C.
2796 ohms @ 77 deg. F. or 25 deg. C.
3520 ohms @ 68 deg. F. or 20 deg. C.
4450 ohms @ 59 deg. F. or 15 deg. C.
5670 ohms @ 50 deg. F. or 10 deg. C.
7280 ohms @ 41 deg. F. or 5 deg. C.
9420 ohms @ 32 deg. F. or 0 deg. C.
12300 ohms @ 23 deg. F. or -5 deg. C.
16180 ohms @ 14 deg. F. or -10 deg. C.
21450 ohms @ 5 deg. F. or -15 deg. C.
28680 ohms @ -4 deg. F. or -20 deg. C.
52700 ohms @ -22 deg. F. or -30 deg. C.
100700 ohms @ -40 deg. F. or - 40 deg. C.

Gaaa! Thanks for the flashback from when I first built the buggy! Info overload!

But great info to go over again though. I REALLY hope its something simple!

[Cherokee Chief]

Your issue has nothing to do with the coolant sensor. It was cutting out. not flouding out.
I would first check your ignition coil max output. and make your coil work at its max output and see if it fails. basically the coil shoule spark a spark at least 1/2" to almost 3/4" blue spark. less than a 1/4" and a yellowish spark the coil is no good. do this dry then do it soaked with water and look all over the coil to see if its leaking spark out the side of the coil.