You need to troubleshoot the transmission solenoid shifts.You are a OBD1. Feedback on the transmission.So in your case there will be no data to be read. This is not uncommon for the shift solenoid B to supply little oil When this happens Solenoid A does not shif to fourth. You basically have a shift solenoid that cannot hold pressure. A good remedy is change transmission filter and fluid. This can help.Other than that solenoid will be needed.
SOURCE: slipping auto trans in 94 chevy truck
actually i would say no because there are 6 cyl transmissions with 4 frction plates and v8's have 5 friction plates in the forward planetary gear
SOURCE: 92 Chevy pickup 2x4 auto transmission shifting abruptly from 1st to 2nd gear
There are several causes for harsh shifting. If you have a vacuum modulator on the right side of the transmission make sure it isn't leaking. (see if any trans fluid is inside by turning it so the nipple for the vacuum hose is pointed down and tap on it) You can also have a broken accumulator spring...some are accessed from outside the case, some are not. An improperly adjusted "kickdown" cable can also cause this. Anything else is internal and would be related to a sticking valve in valve body or pressure loss at an internal shaft seal. You will need a manual for a breakdown of your specific unit to locate these items.
SOURCE: 2000 Chevy Prizm Lsi 4-speed auto trans. problems
That does sound like a linkage adjustment problem.
If that does not work, I'd try a fluid change and filter. But your diagnostics with pulling on the gear shifter is a pretty good indication of a linkage problem.
SOURCE: 96 chevy 3500 5.7 tps low voltage when cold trans
If I understand you correctly, you got a code error on the TPS (Throttle position sensor) If you can get a scanner hooked up to it, and push the gas pedal down slowely and then let off slowely you can watch it on the scanner. This will tell you if the sensor is not smooth, or has dead spots. You might want to start with this.
SOURCE: 1999 Chevy Astro Van. Don't know exact model # of
You should have a 4l60E in your astro van. Which is electrically controlled, so no vacuum modulator. However, to address the ventilation selector not working... look for a vacuum line exiting the firewall and going to the passenger rear of the intake manifold. You will likely find it broken or disconnected there.
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