california standards
Car= 1988 NA GXL.


Replaced so far:
New main cat
New spark plugs
Checked for vacuum leaks
Checked and rechecked grounds
Adjusted the TPS right at 1 ohm
Turned adjustment screw to full lean
Ran Amsoil fuel injector cleaner for about three tank loads.

New items that will be arriving shortly:
New spark plug wires
New fuel filter

Test 1
Some emissions devices where not installed, EGR valve, charcoal canister.
Air pump was directly connected to Catalytic converter
View #’s

Test 2
Reattached all emissions standard devices, and installed air pump to factory standards.
View #’s, wow they got worse

Test 3
Dummy rigged EGR valve.
Installed new items, list above^
Air pump in factory arrangement.
View #’s, the catalytic converter did have an effect on NO #’s.
Hydrocarbon Numbers are similar to first test.


Question:
Why would my hydrocarbon #’s be so high?
What causes this and what to do next?

Thanks for your help

 

Question:
Why would my hydrocarbon #’s be so high?
What causes this and what to do next?

 

Unburnt fuel I believe. Get Rtek7 and try running richer or even lean it out.

 

Maybe misfiring has something to do with high HC, at least that’s what I have dug up by searching.

 

check your timing?

 

and by "turned adjustment screw to full lean" what do you mean? what adjustment screw?

 

timing doesn’t have that big of an effect.

i just checked my fuel rail regulator , and it regulates right at 40psi.

i checked my top two fuel injectors, and they shoot a very nice mist.
i haven’t checked the bottom two, because its a pain
what else could i check

 

timing has a huge effect. make sure it is spot on. if for some reason it is not or you can't get it make sure your TPS is spot on.