Car Is a turd - Toyota Nation Forum : Toyota Car and Truck Forums

govtworkhorse · 01-06-2007, 06:16 AM

Ok. I drive a 92 celica gt 5-speed and it is running like garbage now. First off, I have no power as far as engine goes. There is a loud humming noise coming from engine bay when I let off the gas or cruise at certain rpms. (2500) I have new plugs and wires. All the norm. Curious if anyone has had a similar problem. No engine light. No over heating. Seems like the majority of power loss is at but not limitd to higher rpms.

alltracman78 · 01-06-2007, 06:43 PM

Power loss or lack of power?

The 5SFE is weak up top.
It's designed for lower rpm power.

It won't hurt to do a good tuneup.
Which means no Bosch plugs or such.

Use NGK or Desno [OEM] stuff.

Plugs, cap/rotor, wires [if they need it].
How old is your oil?
How does the air filter look?

govtworkhorse · 01-06-2007, 08:09 PM

I have a new filter, oil, plugs, wires, head gasket, axles, and all kinds of stuff. (Yeah I kow some of those don't help but I was going through the list.) Anyway, it's more of a lack of power. Can barely make it up a hill. I thought maybe it was like some air flow sensor or something. Also has a problem with idle. Will idle normal and all the sudden kick up to 2k and stay there. Then when I take off it wants to drop off and die. I have to rev the shit out of it and drop the clutch. I'm baffled

alltracman78 · 01-07-2007, 11:59 AM

Your ECU uses a MAP sensor.
It reads the pressure in the intake manifold. It doesn't read flow.

Have you checked your EGR valve?
It might be stuck partially open some times.

govtworkhorse · 01-07-2007, 12:12 PM

Thank you. I will check that out and get back to you on the results.

Luckynumber5 · 01-08-2007, 08:36 PM

check the timing belt whoever did the head gasket might have let it slip one tooth on accident (it's easy to do)

alltracman78 · 01-10-2007, 09:49 PM

If it's the timing belt off it should be a constant thing, not sometimes high idle and such.
But it doesn't hurt to check....

Luckynumber5 · 01-11-2007, 01:53 PM

eh you never know with these damn japanese cars

j/k

OBwan · 01-11-2007, 03:22 PM

If its a 92, sounds like the Cat is clogged.

marc780 · 01-11-2007, 07:03 PM

I'd do a compression check and/or an engine leak down test. Also a vacuum reading is simple and could help tell you if the cat is clogged.
these tests will give you a good basis to start with on this engine and if you get low compression readings you wont waste your time changing sensors and so on -