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90-91 360 tbi swap to carb bugs #1568110 01/24/14 07:19 PM 01/24/14 07:19 PM
Joined: Apr 2010 Posts: 166 California H Hotlumpy OP member
Hotlumpy OP member H Joined: Apr 2010 Posts: 166 California	My cousin took a 90-91 TBI 360, put a comp cam, Edelbrock heads, intake and carb on it with an electric fuel pump, dropped it into his 74 dart that ran fine with the factory 318, and now it will not run with ought backfiring under hard throttle. The cam was ordered for a 91, he used the factory dart distributor, we have checked timing and spark, been all through the wiring, tried different fuel pumps but to no avail. Did we misss something swapping parts, or should this combo run fine?

Re: 90-91 360 tbi swap to carb bugs [Re: Hotlumpy] #1568111 01/24/14 07:30 PM 01/24/14 07:30 PM
Joined: May 2003 Posts: 15,487 Florida S scratchnfotraction I Live Here
scratchnfotraction I Live Here S Joined: May 2003 Posts: 15,487 Florida	a 90 -91 360 should have a roller lifter cam. did he replace it with a roller cam? maybe another comp cams that has wiped out a cam lobe. what kinda dist from the dart? elect? points? what carb on it.. going lean and poping maybe?

Re: 90-91 360 tbi swap to carb bugs [Re: scratchnfotraction] #1568112 01/24/14 07:38 PM 01/24/14 07:38 PM
Joined: Apr 2010 Posts: 166 California H Hotlumpy OP member
Hotlumpy OP member H Joined: Apr 2010 Posts: 166 California	Yeah, cam was matched to engine year. Distributor is electronic, MSD coil and bypassed ballast resistor to no avail. Tried three different carbs, now has a brand new Edelbrock 750.

Re: 90-91 360 tbi swap to carb bugs [Re: Hotlumpy] #1568113 01/24/14 07:49 PM 01/24/14 07:49 PM
Joined: Aug 2003 Posts: 12,291 Kent, Wa 340SHORTY Truck Nut
340SHORTY Truck Nut Joined: Aug 2003 Posts: 12,291 Kent, Wa	now has a brand new Edelbrock 750. no wonder it wont run... are you running a orange box ? check the reluctor gap in the dist. whats your fuel pressure ? I am truckless..

Re: 90-91 360 tbi swap to carb bugs [Re: 340SHORTY] #1568114 01/24/14 07:54 PM 01/24/14 07:54 PM
Joined: Apr 2010 Posts: 166 California H Hotlumpy OP member
Hotlumpy OP member H Joined: Apr 2010 Posts: 166 California	Fuel pressure is supposed to be 5.5 max, what am I checking in the dist? Cap and rotor look good, already tried a few distributors with no change

Re: 90-91 360 tbi swap to carb bugs [Re: 340SHORTY] #1568115 01/24/14 08:11 PM 01/24/14 08:11 PM
Joined: Feb 2004 Posts: 7,196 Harrisburg, Pa. screamindriver master
screamindriver master Joined: Feb 2004 Posts: 7,196 Harrisburg, Pa.	Quote: now has a brand new Edelbrock 750. no wonder it wont run... Did edelbrock ever get the issues resolved with this carb and it's application specs ????

Re: 90-91 360 tbi swap to carb bugs [Re: Hotlumpy] #1568116 01/24/14 08:51 PM 01/24/14 08:51 PM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	It backfires ONLY at full throttle? & that is in (up thru) all 3 gears right? Part throttle is OK? got another ECU you could borrow for an hour? You might check psi at the carb inlet @ WOT unless you are sure you have enough delivery right now live every 24 hour block of time like it's your last day on earth

Re: 90-91 360 tbi swap to carb bugs [Re: RapidRobert] #1568117 01/24/14 09:52 PM 01/24/14 09:52 PM
Joined: Apr 2010 Posts: 166 California H Hotlumpy OP member
Hotlumpy OP member H Joined: Apr 2010 Posts: 166 California	Backfires at part throttle sometimes, WOT all the time. Sometimes at low RpM, sometimes high RPM. Installing an in line regulator soon to see if that helps. Have tried other known functioning ECU.

Re: 90-91 360 tbi swap to carb bugs [Re: Hotlumpy] #1568118 01/24/14 10:34 PM 01/24/14 10:34 PM
Joined: Jan 2003 Posts: 6,840 The Swamp S Sixpak master
Sixpak master S Joined: Jan 2003 Posts: 6,840 The Swamp	Anything hanging up in the valve train? Adjustable rockers? The pushrod holes in the original heads, the 308's, were pretty big - wondering if roller cam motors needed the extra clearance and the Eddys don't have it. Wonder if the pushrods are rubbing on the Edelbrocks.

Re: 90-91 360 tbi swap to carb bugs [Re: Sixpak] #1568119 01/24/14 10:36 PM 01/24/14 10:36 PM
Joined: Sep 2007 Posts: 14,889 up yours Supercuda About to go away
Supercuda About to go away Joined: Sep 2007 Posts: 14,889 up yours	Quote: Anything hanging up in the valve train? Adjustable rockers? The pushrod holes in the original heads, the 308's, were pretty big - wondering if roller cam motors needed the extra clearance and the Eddys don't have it. Wonder if the pushrods are rubbing on the Edelbrocks. . Yes, stock roller cam engines had larger pushrod holes to clear the pushrods. They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.

Re: 90-91 360 tbi swap to carb bugs [Re: Hotlumpy] #1568120 01/24/14 11:02 PM 01/24/14 11:02 PM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	with the addit'l info I'm thinking it ain't fuel (including the fact that the tank/sending unit was OK with the 318 & that includes carbs after 3 of em). After 3 dizzys I'm thinking not reluctor gap & not likely phasing was way off on all 3 of em. I'm out on a limb but I'm thinking coil or plugs/plug wires/5/7 plug wires switched. Stay in touch. EDIT any possibility of a vac leak Last edited by RapidRobert; 01/24/14 11:05 PM. live every 24 hour block of time like it's your last day on earth

Re: 90-91 360 tbi swap to carb bugs [Re: RapidRobert] #1568121 01/25/14 12:46 AM 01/25/14 12:46 AM
Joined: Apr 2010 Posts: 166 California H Hotlumpy OP member
Hotlumpy OP member H Joined: Apr 2010 Posts: 166 California	No vacuum leaks, have had the plugs and wires swapped, think I'm gonna look into the pushrods clearance. Also gonna pop the timing chain cover and see if it's off a tooth just for fun. He's been driving the damn thing for two years like this so we've checked a lot of stuff!

Re: 90-91 360 tbi swap to carb bugs [Re: Hotlumpy] #1568122 01/25/14 12:55 AM 01/25/14 12:55 AM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	I think we're gonna laugh when (after) we find it! If it's a symmetrical cam (same lobes) you could get the pushrods of #1 or #6 cyl to where both are moving and are at the same height (rockover) & at that point the timing marks should be within several degrees of TDC (varies slightly since the cam could be advanced) but not 10 or 15 off but with this being a part time occurance I'm thinking something else. Stay in touch, this is a toughie. I want this one live every 24 hour block of time like it's your last day on earth

Re: 90-91 360 tbi swap to carb bugs [Re: Hotlumpy] #1568123 01/25/14 01:02 AM 01/25/14 01:02 AM
Joined: Oct 2005 Posts: 6,048 Back home in PA B BulletBob master
BulletBob master B Joined: Oct 2005 Posts: 6,048 Back home in PA	If the t Chain is a tooth off the manifolds/headers would get cherry red I'd look at the pushrods it's pretty hard to wipe a cam lobe on a roller cam

Re: 90-91 360 tbi swap to carb bugs [Re: BulletBob] #1568124 01/25/14 01:05 AM 01/25/14 01:05 AM
Joined: Oct 2005 Posts: 6,048 Back home in PA B BulletBob master
BulletBob master B Joined: Oct 2005 Posts: 6,048 Back home in PA	Check the bushing in the block for the oil pump shaft I had one wear out & it made the distributor get sloppy & did the very same thing you're talking about

Re: 90-91 360 tbi swap to carb bugs [Re: BulletBob] #1568125 01/25/14 11:55 AM 01/25/14 11:55 AM
Joined: Sep 2007 Posts: 14,889 up yours Supercuda About to go away
Supercuda About to go away Joined: Sep 2007 Posts: 14,889 up yours	Quote: Check the bushing in the block for the oil pump shaft I had one wear out & it made the distributor get sloppy & did the very same thing you're talking about That would tend to make the timing mark jump around as well. They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.

Re: 90-91 360 tbi swap to carb bugs [Re: Supercuda] #1568126 01/25/14 03:53 PM 01/25/14 03:53 PM
Joined: Oct 2005 Posts: 6,048 Back home in PA B BulletBob master
BulletBob master B Joined: Oct 2005 Posts: 6,048 Back home in PA	That's what I thought when SB412Duster told me to check the bushing He said at idle it most likely wouldn't jump real bad I picked the idle up as if I were setting total timing & saw it jump all around I pulled the dizzy & found the bottom bushing & housing wallowed out

Re: 90-91 360 tbi swap to carb bugs [Re: BulletBob] #1568127 01/25/14 06:20 PM 01/25/14 06:20 PM
Joined: Sep 2007 Posts: 14,889 up yours Supercuda About to go away
Supercuda About to go away Joined: Sep 2007 Posts: 14,889 up yours	Hmm, when I bought my 64 300 the timing jumped around a lot, it was a combo of worn out dual point distributor and drive bushing. I will admit the distributor was most of it. They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.

Re: 90-91 360 tbi swap to carb bugs [Re: RapidRobert] #1568128 02/06/14 03:07 AM 02/06/14 03:07 AM
Joined: Apr 2010 Posts: 166 California H Hotlumpy OP member
Hotlumpy OP member H Joined: Apr 2010 Posts: 166 California	I'm gonna check the Dist. Bushing in the block and the pushrods. Just need to find time! That makes sense as the bushing was never even looked at during rebuild. Thanks to everyone, and I'll keep you posted. Rapid Robert you especially have helped me diagnose multiple hair pullers on my Barracuda, namely the bell housing bolts being loose and causing vibration. I chased that one for six months!

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