Please help!!!! My 84 yota is not supplying vacuum to the EGR valve. My repair manual told me to take it to a certified toyota repair person (forget that). Should I spend the $85 bucks for a salvaged computer for my yota? Would that fix the problem? I have looked at the website a ton and I just registered. Oh, by the way, I'm in California and I have to deal with the crappy smog stuff.

Thanks for your help Yota Men!

j_kuhl

 

I realized that I should add more info!

History:

When the cold engine is idling or at 3000 RPM the vacuum line to the EGR valve should read zero vacuum, which my truck does. Once the egine has warmed up (upper radiator hose is hot) the vacuum to the EGR valve should be closed idling and open at around 3000 RPM. Yet, my vacuum line has no vacuum when the engine is warm and running at 3000 RPM.

Could it be the EGR valve? Could it be the CPU?

Any suggestions for diagnostics help would be greatly appreciated.

Thanks,

J_Kuhl

 

My shop manual (for an 85) shows that on a carbed calf. emission truck ( assumptions based on your profile) there is only 1 vac. line leading from the egr back to a BVSV (assumed it's the same for 84). Dont know what BVSV stands for but basically it is a coolant temp. controlled vac. switch. Cold=no vac. through switch Hot=vac through switch. Here's how I would trouble shoot it. 1st remove vac line from egr valve & install vac. gage. 2nd follow vac line from egr valve back to BVSV, should be on intake man. in area of tstat. housing screwed into coolant passage. 3 remove hose from BVSV to egr on BVSV, remove other hose from BVSV that runs to intake/carb connect two hoses w/vacuum splice/tee. Crank vehicle (follow all safety procedures) rev engine to 3200-3500 rpm check for vacuum on gage. No vacuum=clogged/leaking hoses from intake to egr valve repair as required. Vacuum=hoses from intake to egr valve good. Return engine to idle remove vac gage connect hose from gage back to egr valve leave vacuum splice/tee in place on other hoses. rev engine to 3200-3500 rpm see if egr valve moves. if it does egr valve good BVSV bad (assumed engine was at operating temperature). Allow engine to cool drain coolant replace BVSV. BVSV cost? Not shure for toyota other vehicles i've done $20-$100. HTH partszar

 

I will give that I try this Friday, if my wife doesn't give me too hard a time (valentines day)

 

I forgot that I have a vacuum modulator on my 84' which I don't think exists on the 85'. I will still give it a try. I'm sick of getting rapped by mechanics!