Please Help With High Rpm Miss

cptkng79 · September 30th, 2007, 02:56 PM

Having a problem, i can't get my 347 to spin over 5500 rpm. it's like the car is hitting a rev limiter, but the only problem is that the car dosen't have one...

brought it to the dyno a few months ago and she had no problem spinning to 6000 its like it happened overnight damn mice

any ideas????

Drick · September 30th, 2007, 02:58 PM

sounds like preignition like your running to low of octane of gas

cptkng79 · September 30th, 2007, 03:01 PM

im running 104 octane but thanks for replying

do you think i may have a bad distributer

Drick · September 30th, 2007, 03:02 PM

could be spark then not getting enough spark or timing not right

you got me on this one

darkest hour · September 30th, 2007, 03:10 PM

sound like it could be timing

Speedstang302 · September 30th, 2007, 09:11 PM

yeah doesnt sound like a bad distributor, maybe its the spark..but my bet is on the timing is WAY off..but still close enough to run..

Iownastang · September 30th, 2007, 09:31 PM

what compression ratio does the motor have???

Speedstang302 · September 30th, 2007, 09:58 PM

im gunna say like 11:1 or 12:1 as a guess..

IcantDo55 · October 1st, 2007, 09:54 PM

I bet electrical.

Replace wires cap rotor and coil and try again.

PS: the resin it did not do it on the dyno is that the dyno does not load the motor like the real world does.

September 30th, 2007, 02:56 PM	#1
cptkng79 Regular Join Date: Nov 2006 Posts: 123 iTrader: 0 reviews	Please Help With High Rpm Miss Having a problem, i can't get my 347 to spin over 5500 rpm. it's like the car is hitting a rev limiter, but the only problem is that the car dosen't have one... brought it to the dyno a few months ago and she had no problem spinning to 6000 its like it happened overnight damn mice any ideas???? __________________ 518.9 Wheel HP!!!!! 491 Torque!!!!!!!!

September 30th, 2007, 02:58 PM	#2
Drick Big timin' in a small town 2004 FX4 F150, 86 GT Join Date: Apr 2007 Location: Gods country. Nordern Michigan eh Posts: 14,365 iTrader: 1 reviews	sounds like preignition like your running to low of octane of gas __________________ FX4 Crew Crew member #1 Don't take anything I say to heart, I don't try to come off as an asshole. It just happens

September 30th, 2007, 03:01 PM	#3
cptkng79 Regular Join Date: Nov 2006 Posts: 123 iTrader: 0 reviews	im running 104 octane but thanks for replying do you think i may have a bad distributer __________________ 518.9 Wheel HP!!!!! 491 Torque!!!!!!!!

September 30th, 2007, 03:02 PM	#4
Drick Big timin' in a small town 2004 FX4 F150, 86 GT Join Date: Apr 2007 Location: Gods country. Nordern Michigan eh Posts: 14,365 iTrader: 1 reviews	could be spark then not getting enough spark or timing not right you got me on this one __________________ FX4 Crew Crew member #1 Don't take anything I say to heart, I don't try to come off as an asshole. It just happens

September 30th, 2007, 09:11 PM	#6
Speedstang302 I Post Entirely Way Too Much 1996 Mustang GT 13.64@101mph Join Date: Apr 2007 Location: Massachusetss Posts: 5,799 iTrader: 1 reviews	yeah doesnt sound like a bad distributor, maybe its the spark..but my bet is on the timing is WAY off..but still close enough to run.. __________________ 1990 GT- 5.0L \|BBK Shortys\|VRS O/R X\| SLP LM1 Catback\|BBK CAI\| Centerforce Clutch\|MGW Short Throw\| Alum D/S\| 3.73's\| Steeda Springs...about as stock as a 5.0 comes now a days..much more to come

September 30th, 2007, 03:10 PM	#5
darkest hour Newbie Join Date: Sep 2007 Location: athens, alabama Posts: 31 iTrader: 0 reviews	sound like it could be timing

September 30th, 2007, 09:58 PM	#8
Speedstang302 I Post Entirely Way Too Much 1996 Mustang GT 13.64@101mph Join Date: Apr 2007 Location: Massachusetss Posts: 5,799 iTrader: 1 reviews	im gunna say like 11:1 or 12:1 as a guess.. __________________ 1990 GT- 5.0L \|BBK Shortys\|VRS O/R X\| SLP LM1 Catback\|BBK CAI\| Centerforce Clutch\|MGW Short Throw\| Alum D/S\| 3.73's\| Steeda Springs...about as stock as a 5.0 comes now a days..much more to come

October 1st, 2007, 09:54 PM	#9
IcantDo55 Enthusiast Join Date: Aug 2005 Location: Va Beach VA Posts: 590 iTrader: 0 reviews	I bet electrical. Replace wires cap rotor and coil and try again. PS: the resin it did not do it on the dyno is that the dyno does not load the motor like the real world does. __________________ -Mike Link to My Site Want to Play Some Pool??? Stroked and Blown!

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