UltraLexx

This just started happening. When I accelerate hard, and as soon as the motor hits 400rpm it just dies, I mean the engine is still running but it gets stuck on 4000rpm and power (HP) just dies off. I immediatly pulled over and put it in park and tried to rev past 4000 and succesfully did. Can this be an ecu problem or a tranny prob. 93'LS400 133,000 mi
Rich

nagasakki

i hardly ever hit or use 4000 rpm. unless i'm flooring it, I can go up to 6-7k RPM. but I don't want to do that with a lex. Might hurt my baby too much.

But I'm not sure, it could be the Transmission.
Well mostly when tranny is bad, it doesn't shift gear or feel like neutral drive, or not shifting out of 1st or 2nd gear, with only RPM going up, but car not pushing.

sniper

iTrader: (4)

When I had my 90LS, it ran fine, even when drivin very hard, and I bet 100 bux no one has drivin an LS has hard as I have You could not hurt the motor even if you tried. Anyhow, I had a problem somewhat like yours and I also thought it was the tranny. I had various intake systems on my car for a long period of time and then I switched to a factory, un-modded box. With the stock intake system, if you had your foot on the floor, it would sputter somewhat and be very week in the upper RPM range. I opened my intake path back up and the problem was gone. I believe the MAF meter was part of the problem. As an experiment, open up your stock intake and just remove the front half of the box and snug the filter back into the ring clamp that the box uses without the front part of the box. Use clips or clamps if you think you need them. Go for a drive and see if it still gets week at the top end. I think you need either a new air filter or a new air flow meter. Let us know how the experiment works out

nagasakki

good luck with that when it rains...

sniper

iTrader: (4)

Luck with which? an open box? iv had an open box, intake and all that in the rain without problems. Besides, this open box thing is just a test that is going to involve maybe 5 minuets of driving. If the car drives good, at least it will put to rest tranny worries.



UltraLexx, have you had a tranny flush done recently?

JdubES300

it's the Mass air flow sensor. i had the problem with my other car g35 and it would lose power at around 4000rpm.

vraa

iTrader: (2)

I bet I drive harder then you

Celsior Master

i first thought u were talking about someone "engineer" not going over 4000 haha and not "engine"

nagasakki

that depends if he has aftermarket cold air intake. with stock air filter, never has problem like that.

Smoothride

I'd check:

MAF
TPS (Throttle position sensor)
Fuel Pump
Fuel Filter (clogged)
Cat Converter (clogged)

gowest

I have similar problem with your......my car won't rev over 3500 rpm and no mater how hard I push the pedal the trans. shift at about 3500 rpm. The first thing my mechanic check is kick down cable...... after 5 minute of adjusting I'm good to go......check that out, too.

UltraLexx

I removed the front half of the intake and the car drove completelt different. No hesitation and shifted correctly, all the way to redline. Sniper was right on. The filter didnt seem too clogged up I knocked it against the wall a few times and I could see through it. That leaves one thing I guess MAF sensor. I believe the part said Fuji on it. Is it imperitive that OEM be used or an aftermarket piece and How much is expected for the part? This had me concerned I feel much better now..

Thank You everyone that replied.

Rich

ArmyofOne

UltraLexx, on something like an MAF, i would go OEM. Aftermarket may not work correctly. even the slightest varation in materials on an MAF can screw something up royally.

Iron Sheik

I have the same exact problem with my 99 ES 300.
I get stuck at 4,000 rpm at 50 mph (80 km/h) for a second or two and then continue accelerating.
I basically get stuck at 4,000 rpm in every gear except 1st!!!
I guess it is the MAF sensor.
Plus, the car gets slower than it already is at high way speeds!!!!

Iron Sheik

sniper

iTrader: (4)

How much you willing to bet?




Glad you got the problem worked out UltraLexx! I told you it would ease your concerns! BTW, didnt that motor sound sweet when you opened it up