thermactor air system - no operation

[hockeyfreak55]

i drive a 94 bronco 302. today i tripped a code and i looked it up. it says "thermactor air system problem -no operation durring engine run self test". i followed the lines out of the smog pump and couldn't find any promblems. my truck has been whinning when i start it up could the smog pump itself be the problem? what should i check before i do go replace it?

 

[Rons beast]

Have you checked that the pump itself is not seized? It was a common problem on older high milage trucks.

If it is seized, that would explain the whine as well. You may have to replace the belt also.

good luck

 

[miesk5]

yo

As Ron suggested, whining is prob the pump. I use a garde hose section to help track a noise down,

Test; "... 1.Check and, if necessary, adjust the belt tension. Press at the mid-point of the belt's longest straight run. You should be able to depress the belt about 1/2 in. (13mm) at most. 2.Run the engine to normal operating temperature and let it idle. 3.Disconnect the air supply hose from the bypass control valve. If the pump is operating properly, airflow should be felt at the pump outlet. The flow should increase as you increase the engine speed. The pump is not serviceable and should be replaced if it is not functioning properly..."

Source: by Chilton via miesk5

Is it Code 312 Secondary Air Injection (AIR) misdirected during KOER?

If so, or another AIR Sys Code; see my site @ http://www.broncolinks.com/index.php?index=416

Such as;

DTC 311, 312, 313 & 314; "...311 and 314 indicate the Secondary Air Injection system is inoperative. DTC 312 indicates that Secondary Air is misdirected. DTC 313 indicates that Secondary Air is not being bypassed when requested. Possible causes: Visually inspect vacuum lines for disconnects in the AIR system. Visually inspect for proper vacuum line routing. Refer to VECI decal. Visually inspect Air Pump for broken or loose Air Pump Belt. Refer to Section 13A for adjustment/replacement..." READ MUCH MORE

Source: by Jim

 

[hockeyfreak55]

it was the pump itself. it's siezed up. thanks guys