Hey guys, I hate asking questions, because I always have been able to find a fix every problem lol. I have searched and check things for 2 days, and I don't have a clue.

Ok, when driving if I'm easy on the throttle theres no vibration. Speed isn't a factor its only RPM's and Hard Acceleration that cause it. Also I cannot replicate it in neutral it has to be in gear.

Thats about all there is to it. When I accelerate hard or hit arounD 3500-4000 RPM I get a bad vibration in my pedal as if my input shaft was bent. I have replaced the axle already, the upper control arms are pretty new (10,000 mi), as is, the outer tie rod ends (10,000).

BTW I have also been getting excessive amounts of black sut around the sides of the rear bumper. NO CEL.

2 sets of injectors is better than 1 =)

Could be missing horribly at the higher RPM ranges. un-burnt fuel = black bumpers if i remember correctly. Thats my guess ^^

** Current status: 9 bent valves. and it only had 6,000 miles on it. i hope the replacement goes well. **

Lots of expensive parts, and still slow! Oh wait, it has to run to go fast.

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Well, I have been accelerating very midly to avoid any vibration. I still get the sut. I don't notice a misfire any other time, but I'll check my plugs anyway. Thanks

BTW, I do have a spec stage 3 clutch and ther is a slight rattle noise when the vibration starts. I, like everyone else am just hoping its not that crapper lol.

2 sets of injectors is better than 1 =)

sounds like your plugs have really opened up, and getting into high rpms your losing spark, running rich. 'Course usually there'd be some loss of power felt... My car does sort of the same thing, and I think it's a quirk in the engine design (resonance and all that jazz). I corrected mine by adjusting the timing and runnin a bit richer around that RPM.

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'95 GS w/ t3/t4b
FMIC, diy piping & RFL BOV
MS2-Extra Fuel&Spark
50 lb/hr Holley injectors w/ 1:1 RRFPR
JE 8.8:1 dish w/ Hastings Rings
Eagle Rods w/ ARP bolts
ARP Head studs
Mild port/polish head
3" custom DP/cat section, 3" PIT catback
dual MBC - 12 psi / 20psi

How are the motor mounts?
front/rear they could be torn and the motor is moving enough under hard accels that its vibrating on the frame..

1998 dodge avenger 4 cyl AT
Mods are:
Not enough

Good info in this thread for you, imo. If your plugs are more than six months old, it couldn't hurt to just pick up some replacements. Otherwise, yank 'em and check that gap. Also, take a flashlight and scope out your motor mounts.

The soot on the rear bumper makes me believe you've got ignition problems more than mounts, but both are fairly common culprits.

Unburnt fuel. Ugh.



Dont mean to hijack at all but i found an S-afc super cheap and was wondering if this was a good temp on an I/H/E car to lean out? I smell dollar bills comming from my exhaust and i dont like it.

Also, I got some NKG plugs and denso wires not to long ago. I didn't gap the plugs and my car isn't missing, even with the needle bouncing off the rev-limiter. Would gapping them more help out?

This pig-rich bastard makes me unhappy. I'd like to run leaner/more efficient by any means possible.

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Thanks alot for the replies everyone, heres an update.

1. Ok, caliper was sticking a little so i pulled the guides and re-lubed them. This did not fix the vibration problem, must have been an alternate problem.

2. Checked plugs, and they were where white, with only about 15,000 miles on them. ngk standard copper plugs. Must be burning too hot. So i replaced with another set of NGK coppers and gapped accordingly.
Although it did smooth out a little this did not fix my problem.

3. The noise is getting worse and almost sounds like its right by the firewall almost in the middle where the passenger side axle is located. The passengers side axle checked out fine. no clicking when turning in either direction and the boots have no tears at all in them.

4. After more in depth analysis it seems my exhaust tone is alot deeper and is causing alot of vibration in itself. Although I inspected from the cat back and found no leaks, I'm starting to believe it may be an exhaust leak up by the manifold downpipe area.

Thanks again for all the help and any other ideas are welcomed.

2 sets of injectors is better than 1 =)

check your motor mounts, if one or two is bad it'll vibrate like hell especially under acceleration and that can cause the exhaust to spring leaks under the stress of twisting

Erik P.
Official 2GNT thread Hijacker
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I'll do that, thnaks alot. I gave them a quick visual, but ill get a light out and inspect closely. thanks.

2 sets of injectors is better than 1 =)

check the mounts