smsevo8

When I am driving my car at low speeds (25-30MPH) it jerks back and forth. When I give it gas it stops doing it or even if I let off the throttle. I was thinking maybe its just the injectors, but here is the list of my MODS:

• Buschur Racing 2.3L Stroker kit
• Buschur Racing Stage 3 head
• HKS 272,278 Cams
• Buschur Racing HTA3076 V-band Turbo Kit w/ Tubular Header
• Buschur Racing Evolution FMIC
• Tial BOV
• Ported and polished intake manifold with a 65mm throttle body
• Dual Stage Apex boost controller
• AEM EMS Engine Management
• Spark Tech Ignition System
• SMC water and alcohol injection
• RC 1600cc Injectors
• Full Blown fuel system with a boomba fuel rail
• Bushwacker Transmission
• Shepherd racing stage 3 transfer case
• Exedy triple disk Clutch

gsrboi80

iTrader: (38)

Is this something that just started with the car? Was the car running fine with current mods and tune prior?

smsevo8

It's been doing that since I modded the motor and the turbo.

barneyb

I don't know how long you have owned your Evo but my car would do this when new. What it is is driver induced pogo so my car needed a driver adjustment. More power would make it worse.

smsevo8

I've had my car since 2003 and when I have it set at the same speed for a long period of time it starts jerking back and forth. It makes it even worse when I leave it at the same speed.

barneyb

I have a '03 also. Maybe that year is more prone to this. There were a number of posts about this back then. If the car jerks enough it will cause the driver to inadvertently move the accelerator which compounds the problem. But since you've had the car a long time it is probably the mods that have increased the car's sensitivity to this.

Make sure the throttle isn't sticking. Other than that maybe a stiffer motor mount.

smsevo8

I already have a stiff motor mount. When my car was at the dyno the tuner said it might be the injectors. He recommended me to purchase ID 2000cc injectors.

smsevo8

here is the dyno graph

Shortbus115

iTrader: (1)

Could it be the BOV causing it to buck?

smsevo8

I don't think so iv'e seen a lot of Evo's with a Tial BOV

merchomini

iTrader: (2)

IT could be the Tial, min shutters sometimes when i accelerate and then let off but only partially....its like the bov cant decide wether or not to release the pressure.....My front lower motor mount def helped this some, but not completely, now when i let off after building a bunch of boost i let all the way off.......it helps.

I also think that after stiffening up my engine mount this means that my diff travels around a lot more and is sloppy. im going to get diff bushings soon and hopefully there will not be any slop left in the drivtrain to allow any bucking. goodluck

thepoint4life23

iTrader: (3)

Could Be a Boost leak

smsevo8

I will check thanks.

smsevo8

I checked there is no boost leak.

Pal215

iTrader: (12)

If you're talking about partial throttle bucking, it may very well be your bov. I used to have this problem, but after returning to a crushed IX bov the problem disappeared.