Hey guys I'm new here and new to 80 series. I've always wanted one so I sold the crawler and found one.
Got a great deal on a super clean 94 that wasn't running. The po said it was running great until it died at a stop light and wouldn't restart.
His mechanic replaced the fuel pump and fuel filter. No fix. Sweet I have a new fuel pump and pita to change filter! I trailered her home.
I'll check the mechanics work once running. At this point there was no spark, fuel pressure or CEL. Tried B+ to FP. Had fuel pressure still no spark or CEL with key in run. Checked EFI relay it's good. Coil checks out, has power and good ground but no signal to fire. Cranked it over forever trying different stuff.
Here's where it gets weird.... Unplugged the air flow meter CEL comes on engine fires right up runs smooth as silk for 3 seconds and dies. Will fire up and run 3 seconds every time. Plug AFM back in nothing again. Ok I need a new AFM so I pull the cap off and sure enough there's a safety switch inside with bad contacts. Clean the contacts fires up runs great! Drove 15 miles or so very happy. CEL is on but it's running great. Shut the motor off restart and it's running horrible. Stumbling mildly backfiring and acting like its starving for fuel. WOT and rpms take 15 seconds to climb from idle to 3500. Shut it off start again runs great. Shut it of start again stumbling. Every 7th start or so, it's running well enough but pinging like the timing is way off.
Check OBD 1 Morris code. 2 codes: 12 and the code for intake air temp sensor inside the AFM. Code 12 is my concern loss of signal from the crank position sensor to ECM. Test distributor air gaps and ohms. Slightly out of spec. New distributor and still the same problem. Have a new AFM on the way. What a nightmare finding one. I know the AFM is part of the problem but I've never seen one have such a drastic effect. Checked O2 sensor it's in spec TPS is functional but could use to be replaced.
AFM should be here by the end of the week however I'm doubtful it will fix the main problem. I don't know where to go from here. Any help would be greatly appreciated.
Got a great deal on a super clean 94 that wasn't running. The po said it was running great until it died at a stop light and wouldn't restart.
His mechanic replaced the fuel pump and fuel filter. No fix. Sweet I have a new fuel pump and pita to change filter! I trailered her home.
I'll check the mechanics work once running. At this point there was no spark, fuel pressure or CEL. Tried B+ to FP. Had fuel pressure still no spark or CEL with key in run. Checked EFI relay it's good. Coil checks out, has power and good ground but no signal to fire. Cranked it over forever trying different stuff.
Here's where it gets weird.... Unplugged the air flow meter CEL comes on engine fires right up runs smooth as silk for 3 seconds and dies. Will fire up and run 3 seconds every time. Plug AFM back in nothing again. Ok I need a new AFM so I pull the cap off and sure enough there's a safety switch inside with bad contacts. Clean the contacts fires up runs great! Drove 15 miles or so very happy. CEL is on but it's running great. Shut the motor off restart and it's running horrible. Stumbling mildly backfiring and acting like its starving for fuel. WOT and rpms take 15 seconds to climb from idle to 3500. Shut it off start again runs great. Shut it of start again stumbling. Every 7th start or so, it's running well enough but pinging like the timing is way off.
Check OBD 1 Morris code. 2 codes: 12 and the code for intake air temp sensor inside the AFM. Code 12 is my concern loss of signal from the crank position sensor to ECM. Test distributor air gaps and ohms. Slightly out of spec. New distributor and still the same problem. Have a new AFM on the way. What a nightmare finding one. I know the AFM is part of the problem but I've never seen one have such a drastic effect. Checked O2 sensor it's in spec TPS is functional but could use to be replaced.
AFM should be here by the end of the week however I'm doubtful it will fix the main problem. I don't know where to go from here. Any help would be greatly appreciated.