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Get Chopped!
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Discussion Starter #1 (Edited)
Engine won't rev past 2000 rpm while out of gear I.e. while in park or neutral, in drive it revs fine. It's literally like it's hitting some sort of limiter while in park or neutral, it revs till 2k then cuts off, revs again, cuts off and so on.

It's strange what's causing this. I have been experiencing shift problems like the shifts are rough and the shifts are very delayed as well. Had my trans fluid and filter replaced a while ago thinking this would fix the shifting issue.

So what I had done to troubleshoot it from my side, I had checked for codes and transmission is giving code 63 which is something related to solenoid 2.
Then I reset the ecu by pulling out the EFI fuse and restarting the car it starts revving fine but shifting into drive and back to park/neutral brings back the issue.

Can someone please help me with this? :smile:
Mine is a 1993 4 cyl auto.
 

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We had this problem with an '00 5S-FE, and it turned out the hose had disconnected from the MAP sensor... no matter the throttle position, with no air-pressure reading, the engine thought the car was idling, no matter the throttle position.
 

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Get Chopped!
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Discussion Starter #4 (Edited)
The problem solved by itself :lol: While I was a stop light I gave it some gas and it hit the limiter twice at 2000 rpm and then it has been revving fine since.
I've tried it a couple of times after that and there were no issues.

I had disconnected the TPS and giving it gas makes no difference. It revs to redline no matter whether the TPS is connected or disconnected and doesn't throw a CEL either.

MAP sensor hose has been connected properly, so I don't think that was causing the issue.
A while back I had an issue with the MAP sensor where there was a crack on the end of the hose and it made the engine run so poorly (misfiring) and it was rolling coal like a diesel.

So for now the problem has disappeared without a reason why it was happening in the first place. :lol:

Thank you for your responses. :D
 

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MAP sensor hose has been connected properly, so I don't think that was causing the issue.
A while back I had an issue with the MAP sensor where there was a crack on the end of the hose and it made the engine run so poorly (misfiring) and it was rolling coal like a diesel.
A leaking/disconnected MAP sensor will lead to crazy-lean... throttle plate is introducing un-metered air, so fuel is constant (idle), while air is variable (wot), leading to lean. A disconnected MAP will be technically derivable, yet you won't go fast.

We had an EGR valve that stuck open... so there was un-metered air coming from the exhaust, and ran like crap. Finally just disconnected it, and haven't gotten around to replacing it (now throwing a code). Also ran lean, ugh. At least it didn't stick closed, which would be rich (if the system didn't take it out of the loop).
 

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Get Chopped!
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Discussion Starter #6
Restarting an old thread.

The problem is back again but now with a bang. The car is barely drivable now, keeps on hitting the rev limiter in gear or neutral around 2000 rpm.

Things that I tried:
Resetting the ECU by removing the battery.
Unplugging the MAP and TPS sensors.
Unplugging the thermostat.

None of them helped.

Can an unplugged MAP also cause it not to rev past 2000 rpm?
 

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'00 4 Cyl. Auto Camry LE
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860 Posts
To the best of my knowledge, No. If anything, the ECM would command additional fuel / the motor would run rich.

Is the issue still only happening when the vehicle is in park, and not (D)rive?
 

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Get Chopped!
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Discussion Starter #9
Recently it started happening while in drive too!
It's intermittent, sometimes it happens and sometimes it does not.
 

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'00 4 Cyl. Auto Camry LE
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860 Posts
If still no CEL,

It's electrical (voltage), fuel delivery, air (Intake / Exhaust), or mechanical timing (Distributor) related.

How old is the Battery,
how old is the Distributor,
how many miles / years on the Timing Belt, Water pump, Idler & tension pulleys,

and how old is the Fuel Pump in the vehicle?
 

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Get Chopped!
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Discussion Starter #11
No CEL.

Battery is a year old, timing belt is also fairly new.
Water pump, idler and tension pulleys haven't been replaced.

Fuel pump is the original.
 

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'00 4 Cyl. Auto Camry LE
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860 Posts
Is there any vehicle / or motor "bucking" when the motor hits the 2k RPM range? Like it "wants" to go, but doesn't (start/stop/start/stop,etc..)

Or is it just "it either works, or doesn't"?
 

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Get Chopped!
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Discussion Starter #13
When the issue is on its like the car is bouncing on the Rev limiter. Basically a fuel cut off is happening, revs up to 2k range fuel cuts off starts revving again and then cuts off.
 

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'00 4 Cyl. Auto Camry LE
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860 Posts
Ok, so it feels like a motor power dropoff / cutoff, then it picks up again, correct?

re: Fuel cut-off, have you confirmed this is the case? By hooking up a fuel pressure gauge in-line, and observing fuel pressure readings when the issue is occurring?
 

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Get Chopped!
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Discussion Starter #15
Yep, that's exactly what's happening.

I haven't confirmed that's the case, don't have the necessary tools for that.
Is there any other way there can be a cut off?
 

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'93 LE Wagon V6 '94 LE I4
'93 V6 wagon, '94 I4
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853 Posts
I recently saw an episode of Wheeler Dealers on TV where they had a similar problem, though not quite as severe. The cause was a clogged fuel filter. FWIW. YMMV.
 

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'00 4 Cyl. Auto Camry LE
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860 Posts
If you suspect it is fuel: then I would diagnose fuel first - ^^ a new fuel filter, and a test light, and/or buzzer, back-probed or pierce-probed into the positive (+) feed for the Fuel Pump: so you can visually confirm / or hear if the fuel pump is getting power .. when the issue occurs.

Another alternative is to install a fuel pressure gauge in-line between the fuel filter outlet <-> and fuel rail, to observe pressure when operating.
 

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Get Chopped!
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Discussion Starter #18
It wouldn't be a clogged filter because I had it replaced a while ago.

Like I said once the car gets back into senses, it revs happily.

What else can cause this issue? Vacuum leaks?
 

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'93 LE Wagon V6 '94 LE I4
'93 V6 wagon, '94 I4
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853 Posts
It wouldn't be a clogged filter because I had it replaced a while ago.

Like I said once the car gets back into senses, it revs happily.

What else can cause this issue? Vacuum leaks?
If there is crap in the tank and no sock on the pick-up, even a new filter could clog up quickly. You may need to pull the fuel pump and examine it.
 

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'00 4 Cyl. Auto Camry LE
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860 Posts
What else can cause this issue? Vacuum leaks?
It would have to be a massive leak. The unmetered air would cause high or erratic idle, which you did not indicate was happening. Would a sticking/bound EGR valve cause this? Dunno. In my experience it would cause driveability issues you do not seem to be having, but anything is possible.

Possible causes:
Low fuel pressure (Clogged Fuel System,Injector(s),Fuel Pump, Fuel Pressure Regulator).
Ignition system issue (Bad coil, bad Ignition wire(s), incorrect firing order, failing Distributor (NE/G1/G2 pickups,Rotor/Cap/Gap or other mechanical issue) incorrect base Distributor timing, incorrect or bad/shorted Spark Plug(s)).
Excessive exhaust back-pressure (collapsed/failed Cat. converter, clogged muffler, crushed exhaust pipe).
Mechanical Timing issue (incorrect static mechanical timing alignment between crankshaft/piston and camshaft @ #1 TDC, failing or mechanically bound Idler/Tension/Water Pump pulley(s)).
Low system voltage to component(s) (Primary charging system or cable(s), loose, or failing Relay/Fuse/Switch/Connector/ or Wiring).
Intermittent issue w/, or failing ECM.
 
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