Hesitation at higher rpm's

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Jun 23, 2004 | 11:48 AM

Cowzzz

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From: Iowa

Hesitation at higher rpm's

i have a 88 t2 and latly ive noticed alot of hesitation at 4500 - 6500 rpm. but its not constint, it will hesitate then catch then hesitate again then catch full power. ive done some reasherch, can it be grounds? if it is where should i re-ground. or could it be secondarys( my AFR gauge says im running rich though)????? any help will be great.

Cowzzz

Jun 23, 2004 | 11:51 AM

sunshine

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From: MN

Did you recently preform a silicon/rubber vac tube upgrade? If so...there is a small "pellet" in the boost sensor vac line. That may be missing, and related to the hestitation.

Jun 23, 2004 | 11:54 AM

TwEaK

Rotors? What Are Those?

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From: Jefferson City, Tn

heres a link on a how to ground your car to get rid of the rpm hesitation.... https://www.rx7club.com/forum/showth...hreadid=199558

check it out...

TwEaK

Jun 23, 2004 | 11:58 AM

SureShot

Seduced by the DARK SIDE

Joined: Apr 2001

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From: Orange Park FL (near Jax)

1) Inspect & clean or beef up the firewall to bellhousing ground.

2) As "sunshine" said if the boost sensor sees spikes it can give fuel cuts.

3) If the TPS is worn enough to have drop-outs in the resistance value as you open the throttle, the ECU will give fuel cuts.

Jun 23, 2004 | 08:23 PM

White 87 13B

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From: New Mexico

The ground on the top of my motor was loose...I tightened it and that was that!

Jun 23, 2004 | 09:01 PM

WAYNE88N/A

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From: Coldspring TX

Another good idea is to run a jumper from that rear rotor housing ground location directly to the firewall, to back up the tranny-to-firewall ground. Clean up the original terminal/housing ground, and install the new terminal directly on top of the original one , then bolt 'em back down. Applying a dab of silicone (black or red to take the heat) over the bolt & terminals area will help keep further dirt & corrosion at bay.

Ahh, I finally got to read the "grounding how-to"...Not very impressed, I must say...90% of it is either overkill, or not designed correctly to supplant the OEM grounds the way the ECU wants to see them...Obviously not written by someone with real-world commercial or engineering electrical experience...

I am usually a congenial guy, always open to new ideas and suggestions, but when I see the BS you guys are doing to your cars using this "how-to", it pisses me off...