hello folks, i have been ghosting this site for awhile and have some questions some of you might be able to help me with. i have a 95 blazer that is a real money pit. it says obd1 compliant under the hood but i hooked it up to obd2 scanner and got the following codes..po172..p1406..po700..p1100..anyone know what is going on here? i have had this truck since 99 and it has been problem after problem..165000 miles..cant get rid of it we are joined at my wallet. many thanks in advance

 

Well, u are in the right place for help......start with the 1st code stored in memory...generally this is the problem. The other codes are usually a result of the initial problem code.....po0172 rich condition bank 1, it sounds as if u need to do a fuel system pressure test.... there is a link somewhere on the forum for this...the injection system on these trks is notorious for having issues.....goodluck

 

Your 95 has a transition system from OBDI to OBDII. It is commonly referred to as OBD1.5 and not all scan tools will communicate with it. It is not fully OBDII compliant.

P0172 is a rich condition on bank 1. Your system only has one bank, so the PCM can not narrow it down to a specific bank of the engine, (could be one cylinder, could be all of them are running rich). Connect a fuel pressure tester to the service port near the distributor. Key ON, engine OFF, fuel pump running, pressure must be 55psi to 61psi. It must remain above 50psi for at least 10 minutes after the pump shuts off. Post your results.

 

sorry it took so long to get back on here..i let the old truck sit until i was tired of looking at it..i just changed out the spider and nut..it runs like new now..almost.now the abs light is on..always something with this truck.i hate turning wrenches..anyways thanks forum for being here

 

From what I experienced and seen here these types of running conditions are all most always from either the fuel pump and or the regulator/spider assembly. It's almost worth it to just go ahead and put new fuel pumps and updated injector spiders in then as a service interval procedure unless it is an 03 or newer.