928 Forum
Sponsored by:
Sponsored by: 928 Specialists

88 S4 in first wont rev past 4100 rpm...?

Old 07-01-2011, 03:28 AM
Thread Starter
marinesniper0318's Avatar
Join Date: Mar 2011
Location: Fort Lauderdale, FL
Posts: 248
Default 88 S4 in first wont rev past 4100 rpm...?

My 88, S4 when in first with the pedal to the floor will not go beyond 4100rpm, it shifts to second. Second and Third gear got beyond 5500RPM with no issue...?

Also sometimes or most of the time I dont feel like I am getting 100% out of the throttle, I checked the idle click and that seems ok but have not done the WOT there an easy way to do this...? It just seems to pull slow at times, it revs in 2-4 gear just slowly at times...?

any thoughts...? One issue is one of my oil breather hoses has ruptured...could this be a possible culprit...?

marinesniper0318 is offline  
Old 07-01-2011, 11:25 AM
Rennlist Member
SteveG's Avatar
Join Date: Jul 2001
Location: New York
Posts: 5,908

I had something similar on an '85; at speed (65) it had no accel, flooring it in 4th or 5th would do nothing. Turned out to be corrosion on a coil wire.
SteveG is offline  
Old 07-01-2011, 11:28 AM
Official Bay Area Patriot
Fuse 24 Assassin
Rennlist Member
Mongo's Avatar
Join Date: Nov 2001
Location: Holding the Line Against the Libs (SF Bay Area)
Posts: 31,223

You can test out your throttle switch by disconnecting the LH & EZK plugs. Check this thread for details. It has tons of info!

I too would also recommend checking for corrosion on the coil wires and inspect the distributor caps & rotors.

EDIT: After seeing Jim's post, this may be the more reasonable cause of your problems. Also, is your kickdown cable slacked?

Last edited by Mongo; 07-01-2011 at 12:52 PM.
Mongo is offline  
Old 07-01-2011, 12:29 PM
James Bailey
Lifetime Rennlist
James Bailey's Avatar
Join Date: Feb 2009
Posts: 18,054

The auto trans has no brains so must rely on mechanical inputs to determine how it shifts. Vacuum is one input and the pressure cable from the side of the intake is another. If your throttle cable has stretched or missadjusted and you are not getting full movement then the pressure cable is not telling the transmission that you have the pedal floored. Not knowing what you want to do the trans will shift early and smoothly since you are not in any hurry.....
James Bailey is offline  
Old 07-01-2011, 01:25 PM

Rennlist Member
Rennlist Site Sponsor

Join Date: Jun 2001
Location: Acworth, GA
Posts: 6,469

First, check the adjustment of the cable from the throttle pedal to the quadrant. You are aiming for somewhere between almost zero slack but zero pre-load.

Next, check the adjustment on the cable from the quadrant to the throttle body. Again, just a tiny bit of slack. Check for the throttle switch click that should happen as soon as you move the throttle pedal. Check for wide-open throttle. Check the closing of the WOT switch at about two-thirds throttle. No click - you have to check at the ECU connector. You can check the idle switch at the same time.

The cruise control cable should always have some slack.

Under the car on the driver's side of the transmission, find the vacuum modulator. Check for full manifold vacuum - measure the vacuum at the manifold (make sure that you are measuring raw manifold vacuum - no check valves or boosters), then measure the vacuum at the hose at the modulator. The readings should be the same. If not, fix the leak.

With the car in a quiet place, turn the ignition switch on and roll down the widows. Push the throttle to the floor and listen for the click from under the car at full throttle. This is the kick-down solenoid. The kick-down solenoid activation makes the transmission more reluctant to upshift, more anxious to downshift.

When these are correct, start adjusting the transmission cable. Tighten a little, drive for a couple of days. Repeat until you like the speeds at which the transmission shifts.

If necessary, adjust the modulator to soften or firm up the shifts. The cable adjusts shift speed, the modulator adjusts shift firmness.
WallyP is offline  

Thread Tools
Search this Thread

Contact Us - About Us - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: