Question about 1998 GMC Safari

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DTC code P0420 and P0452 98 GMC SAFARI

OK i am between the sword and a thick and tall wall! my Dad is trying to fix this van and we don't have a scan tool and y barely have tools, my dad used to work in a smog check and thinks he is a teen, he now tell me he charged to fix this van and he has not done anything to fix it, i lost my job my mechanic skills are not good, and were living in Tj y have no way to go whit friends whit scan tool to help me out, till now all i can do is go to local auto zone so they can scan codes but thats it, they wont reset, i already fixed the gas cap, don't know how to test th FTP or have money to replace it, i pulled down the gas tank 3 times to check for leaks, canister, there is some type of injector close to it that does not do anithing, i pilled the the oxigen sensor for bank 1 the first one fron engine to cat, played whit timing turning distr, those codes dont seem to go away, i dont know what to do, please help

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I just went through this on my 98 safari. P0420 scanned catylist deficiency. I changed my fuel filter. Took about 30 mins. lost minamal fuel amounts. Part cost: $7.00. This fixed mine.Didn't need to jack it up. You can if need be. Takes 2 wrenches, 1 small socket, filter, and drip pan. All pretty much self explanitory, once you find the filter. Nothing will blow up, just be careful, and don't smoke anywhere near it. As for clearing the code...I don't know. I have a scanner that I used. As for the P452 code. Don't know anything about that. Hope this helps.

Posted on Apr 21, 2009

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You may need a mechanic. At least a shop manual.
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1 Answer

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My dad is having trouble starting his 95 GMC Safari Conversion van after it has been running. After setting overnight the van starts right up. If he runs a short errand, turns it off, then tries to start...

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