4g63 talon rpm change

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blueman803
Helpful MS/Extra'er
Posts: 38
Joined: Mon Dec 12, 2005 12:40 pm

4g63 talon rpm change

Post by blueman803 »

Hey, I had it working right two days ago, then today I crank it up and the tach is almost 400 rpm off of what MS shows. What could cause that to change? It is also running like crap. Any ideas?
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aero
Helpful MS/Extra'er
Posts: 77
Joined: Fri Feb 11, 2005 3:14 pm

Re: 4g63 talon rpm change

Post by aero »

blueman803 wrote:Hey, I had it working right two days ago, then today I crank it up and the tach is almost 400 rpm off of what MS shows. What could cause that to change? It is also running like crap. Any ideas?
How are you driving the tach? Driving it off the stock tach driver circuit?
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blueman803
Helpful MS/Extra'er
Posts: 38
Joined: Mon Dec 12, 2005 12:40 pm

Post by blueman803 »

I figured it out, the plugs were fouled pretty badly. It was misfiring and consequently running at a slightly lower rpm, yet the tach was stock and triggered off the coil firings.
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dieselgeek
Master MS/Extra'er
Posts: 484
Joined: Wed Sep 08, 2004 12:27 pm
Location: The Midwest

Re: 4g63 talon rpm change

Post by dieselgeek »

blueman803 wrote:Hey, I had it working right two days ago, then today I crank it up and the tach is almost 400 rpm off of what MS shows. What could cause that to change? It is also running like crap. Any ideas?

double check nothing changed in your constants page...


-scott
Squirted: it's easier to list the ones I haven't squirted. I need to do more motorcycle engines!
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