First Off I Have A 1990 Toyota 3.0l Auto,, It Has Gradually Lost Power Over The Summer And Now Wont Go Up Hills Or Barely Get To Speed. Itll Take 15min. To Warm Up To Even Move And If You Hit The Gas When Its Cold Itll Stall. What Ive Done>>>checked Timing, Did A Compression And Leak Down Test, Replaced The Cap, Rotor, Plugs, Wires,air Filter, Fuel Filter,mass Air Flow Sensor, Oxygen Sensor,cut Off The Cat. Converter(in Case It Was Clogged)checked The Injectors, Changed The Computer, If I Advance The Timing Itll Run Better Than Ever Has But I Cant Keep It Like That. Any Ideas Will Help Its Been To 3 Shops And No Ideas I Need Some Help, I Also Live In Upstate Ny If I Can Pay Someone To Come Check It Out Thanks For Any Info!!!!!!

 

What was the compression readings? Whats the engine vacuum at idle? Was cam timing checked? Find it hard to believe 4 shops can't figure it out, lots of parts being thrown at it due to guessing...

 

my best guess is fuel injectors you say u checked them but how flow testing is the only way to see what they are really doing. I had a similar problem my truck was runnign really rich and had no power

 

How do you check the injectors?

 

could it NOT be engine related? something in the tranny/drivetrain boggin it down?

 

Just throwing ideas.

Whats the timing belt look like?
Is it still lined up properly? Wonder if it is stretched?

 

mine runs like crap too despite the fact that its been tuned up recently as well. It all started after the smog man tweeked my timing. Seems to run best when I have the timing at 14-16 btdc, and I get no pinging at those settings

 

Did you pull the distributor? Hov is the fuel flow to the engine? Fuel pump?

 

The timing belt was just replaced last year, i checked it and it was correct! i pulled the distributer out and timed that correctly. I know the fuel pump works fine but i havent done a fuel pressure test yet. um the injectors are all spraying the same but i was under the impression that they were saposto mist? mine flow! the shops say that theres no way they all are bad at once but that why they changed the computer? i donno and its getting expensive guessing but i gotta have my toyota back!! maybe the tps sensor?

 

the compression test readings were 165psi per cylinder, the truck hardly runs but some other people on tacomaterritory.com sugested that the power situation maybe be cause of the tranny, how much is it to have the injectors flow tested? anyone live around upstate ny?

 

the compression test readings were 165psi per cylinder, the truck hardly runs but some other people on tacomaterritory.com sugested that the power situation maybe be cause of the tranny, how much is it to have the injectors flow tested? anyone live around upstate ny?

 

the compression test readings were 165psi per cylinder, the truck hardly runs but some other people on tacomaterritory.com sugested that the power situation maybe be cause of the tranny, how much is it to have the injectors flow tested? anyone live around upstate ny?

 

the compression test readings were 165psi per cylinder, the truck hardly runs but some other people on tacomaterritory.com sugested that the power situation maybe be cause of the tranny,it shifts fine but might be "binding"? how much is it to have the injectors flow tested? anyone live around upstate ny?

 

might be a dumb suggestion, but when you floor the peddle, is it opening the throttle body all the way? Maybe a throttle cable problem? or maybe the butterfly valve on the maf unit is stuck shut?

 

The fuel injectors are flowing not misting, and you haven't checked fuel pressure yet. I aint no kinda mechaniac but I'm just guessing it sounds like your fuel pressure is really low. I would guess that the gas being poured into the engine isn't getting burned properly. And to really go out on a limb.. since that gas isn't being burned, neither is the Oxygen. So the O2 sensor enrichens the mixture to make up for all that oxygen not being burned with the gas You could have fuel pressure problems and mixture problems. But like I said, I'm just guessing

 

just wondering if I was right about this or if this thread was forgotten

 

maybe clogged filter, but I'm guessing fuel pump failure.

 

He said he checked the fuel pump and it was good, so go with a clogged filter, way back under the bed by the right side tire, I think. Its very small, so clogs easily. Check it out.

 

I've seen similar symptoms from a clogged/collapsed muffler or cat.

 

i have replaced the fuel filter and the pump seems to work fine, the shop will let me know tuesday morning what the fuel pressure is. the reason why i thouhgt the injectors were shot is because they poor fuel and dont mist which means they arnt atomizing the fuel, if i spray the t.b. with starting fluid itll purr great.