4A 16 EMISSIDII l30IlT l0LS EXllA ST SYSTEMS 1 VI EGR DEUY VALVE should close seat vstgthin 0 5 sehonddof lessi If valve does not seat within is time rep ace e ay va ve An EGR delay valve is used on models equipped with 360 401 CID engines and 4V carburetor The delay valve is installed between the EGR valve and Deny VALVE back pressure sensor fig 4A 14 and delays the vacuum signal to the EGR valve to prevent stumble or hesitation on initial acceleration The delay valve is E VA UUMSIDE color coded to prevent improper installation The red lgglglus R5 side of the valve connects to the back pressure sensor and the blue side connects to the EGR valve Dalay Valvo Tm Bypass the back pressure sensor when performing this test as the sensor has a bleed which may give false readings 1 Install a tee in vacuum line between red side of delay valve and vacuum source 2 Attach vacuum gauge to tee 3 Start engine and while observing EGR valve operation increase rpm until 3 to 10 inches of vacuum are indicated on the gauge It should take from 18 to 32 seconds for the vacuum signal to reach the EGR valve 4 Replace delay valve if delay is longer than 32 EGR VALVE Q 0 hRES URE or less than 18 seconds 60 0 5 While maintaining a 3 to 10 inch vacuum dis connect vacuum line from delay valve EGR valve Fl M N EGIlI1 lty hlv Page Pm Banvnmr upumlan AA 16 Gmwal 4A 16 Catalyst lhplnuunnnt Pruonlm M 11 E E A reduces carbon monoxide and hydrocarbons to halrm less carbon dioxide and water The catalysts w ic All C m d lS Wlth V engmes and all C hf m1 produce this action are platinum and palladium pres CJ models have catalytic converters Leaded fuel ent as 3 fine coating Oh heads of ah1mh m poisons the catalytic converter although use of a few The temperature of the converter during this gall sl qi leeds fuel ll en emergency d S mt chemical reaction is somewhat higher than that of ex seriousyimpair econver er h th 1 th h t I t To avoid confusion all CJ models are fitted with a kits glizeguiiide eghisag thee cixggier at 1 3 fuel filler neck restrictor refer to Fuel Carburetion Same temperature as the mumeh Due ho its solid iecumfl Tdmlts ly the smaller nmles used mass however the catalytic converter stays hot much Or ee E longer than the muffler The catalytic converter body ia stainless steel which WNVEMER UPEMTIDN is designed to last the life of the car Excessive heat All exhaust gases flow through the catalytic con can result in bulging or other distortion but excessive verter where a chemical change takes place which heat is not the fault of the c0nverter the vehicle has