Have no power when accelerating HELP!

[Tezmaster]

Hey guys ! i have 1988 GTS Celica 3s-ge motor !!!

When i take off its fine but when it hits around 3500rpm after that seems like there nomore power!!! the clutch is fine was just replaced! 3500 Km ago! and max i have gotin it was up to 80 km floored! in 4th and i tryed down shifting and still 80 floored!

Im thinking its a o2 sensor,MAP Sensor!

also the throttle body screw is 1/4 turn open if i open it any more it idles way to high!!! i have checked for vaccum leaks cant find any!!!! help!

[Tezmaster]

Well tell you what! as i was test driving to see if i have fixed the power problem couple of bolts came out well i turned around and went home! and i jacked up the car and i see that there the engine mount bolts!!! also the support member going from gas tank to front wasnt bolted on! after i put the 2 bolts were they needed to go plus that other bolt!!! it had way more toque!

nOW I timed it to 10Degrees! as it should be ~! but my rpms are high 1300rpm plus its really RICH!!!!! How can i adjust the fuel amount! Or is there a way to reset it!

[Tezmaster]

Would this be causeing high idle! also what is it!

[stepho]

That looks like a vacuum valve that goes between the brake booster an the manifold. The manifold sucks the air out of the booster (ie makes vacuum) and this little valve makes sure that air doesn't get back in.
If it becomes permanently open then it acts like a huge manifold leak and the engine will die unless the idle is set really high.
At least that what happens when it is plumbed in.
Not sure why yours has no hoses.

- Stepho

[Tezmaster]

hey well ...... after the AFM then to a air tube hose to the thottlebody right

then underneth that hose is the pvc hose to the check valve then to the air intake manafold after the throttle body

[Tezmaster]

under the cold start injector

[keving85]

Originally Posted by Tezmaster

Hey guys ! i have 1988 GTS Celica 3s-ge motor !!!

When i take off its fine but when it hits around 3500rpm after that seems like there nomore power!!! the clutch is fine was just replaced! 3500 Km ago! and max i have gotin it was up to 80 km floored! in 4th and i tryed down shifting and still 80 floored!

Im thinking its a o2 sensor,MAP Sensor!

also the throttle body screw is 1/4 turn open if i open it any more it idles way to high!!! i have checked for vaccum leaks cant find any!!!! help!

does it sound like the engine is under a real heavy load at about 3500 rpm and dosnt want to go any farther.........

i description of what i am tlaking about could be similar to the sound of a car on a dyno.......????
if so you could be looking at a stopped up cat or some heavy restriction in the exhaust system...

kev

[Tezmaster]

well i knocked all the stuff out of the cat sooo maybe the rest is clogged

[keving85]

Originally Posted by Tezmaster

well i knocked all the stuff out of the cat sooo maybe the rest is clogged

disconnect at the exhasut manifold and then drive your car... if it gets better than you found your problem... clogged exhaust system.... and if not look at your fuel pressure.....

kev

[Tezmaster]

ok and the idle is to high the (dizzy screw) TB screw is closed and it idles at 1300-1400 rpm it is irract every 5 secs its 1400 then to 1300 so on and soo on

[keving85]

Originally Posted by Tezmaster

ok and the idle is to high the (dizzy screw) TB screw is closed and it idles at 1300-1400 rpm it is irract every 5 secs its 1400 then to 1300 so on and soo on

this may not have something to do with your car not going pulling past 3500 rpm but something you can check for your idle issue
NotesFig. 66 ISC valve test connections
Fig. 67 ISC valve test connections.

5M-GE, 7M-GE & 7M-GTE

1. Remove ISC valve from throttle body.
2. Check resistance between terminal B1 and S1 or S3 , and between B2 and S2 or S4 , Figs. 66 and 67. Resistance should be 10---30 ohms.
3. Connect battery positive terminal to valve terminals B1 and B2 , then ground terminals S1 , S2 , S3 and S4 in sequence. Valve should move towards closed position.
4. Connect battery positive terminals B1 and B2 , then ground terminals S4 , S3 , S2 and S1 in sequence. Valve should move towards open position.
5. If valve fails to perform as outlined, valve is defective.
6. Install ISC valve, then check idle speed as follows:

• 1. Run engine until it reaches normal operating temperature, then ensure air cleaner and all vacuum hoses are properly installed, all accessories are off and transmission selector is in neutral.
  2. Connect voltmeter to check engine connector terminals E1 and VF.
  3. Run engine at 2500 RPM and ensure voltmeter needle fluctuates 8 times or more in 10 seconds. If not, check oxygen sensor.
  4. With engine idling, check that speeds are within specifications and voltmeter reading is 1.25---3.75 volts.
  5. If idle speeds or voltage is not within specifications, check for vacuum leaks, defective throttle body, throttle position switch or ECU, and correct as needed.

Fig. 68 ISC valve test connections.

3S-FE

1. Disconnect ISC valve wiring connector.
2. Using suitable ohmmeter, measure resistance between +B and ISC1 terminals, then between +B and ISC2 terminals, Fig. 68.
3. Resistance between both sets of terminals should be 16---17 ohms. If readings obtained are not as specified, replace ISC valve.
4. Connect ISC valve wiring connector.

[keving85]

Originally Posted by Tezmaster

ok and the idle is to high the (dizzy screw) TB screw is closed and it idles at 1300-1400 rpm it is irract every 5 secs its 1400 then to 1300 so on and soo on

on this one hook your volt meter up to the signal wire going back to the ecu from the map sensor connector.. you will need to back probe this connector.... match your readings up to this chart...... go thru out the rpm range and check as follows....

Fig. 2 Manifold Absolute, Vacuum, and Barometric Pressure Sensors

[Tezmaster]

i dont have turbo so i dont have map sensor i dont think im a noob and i have 3SGE motor! so this doesnt help

[keving85]

Originally Posted by Tezmaster

i dont have turbo so i dont have map sensor i dont think im a noob and i have 3SGE motor! so this doesnt help

my apology..... alldata aint worth a damn...... i'll look some more stuff up for ya tomorrow.......



i typed in the right car they are just showin me the wrong specs...... i'll show ya.. this service aint worth paying for...

1988 Toyota Celica 2WD L4-1998cc 2.0L DOHC (3S-GE)

Vehicle Level Powertrain Management Computers and Control Systems Manifold Pressure/Vacuum Sensor Specifications Electrical Specifications Electrical SpecificationsSpecificationsNotes Fig. 2 Manifold Absolute, Vacuum, and Barometric Pressure Sensors

[Tezmaster]

thank you and i did a tps test on the 3sge motor its fine