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iEA (EMISSFIRE) TRAINING
1999 Ranger 2.5L std. trans, 117K miles
by Rusty Flake - Beck Service Center
Complaint: Starts and idles fine, but surges when put into gear. When I went to the truck and started it, it bucked and jerked and died several times before it got to where it would even idle. After letting it run long enough to stabilize at idle(several minutes) I tried to drive it into the shop, it could not be throttled up or it would sputter and jerk and die. I had to let it idle and slowly release the clutch to get it rolling enough to coax it into the shop. After finally getting into my bay, Ipulled codes and retrieved P0171 sys lean, I then connected my gas analyzer to look at lambda out the tail pipe. The exhaust showedbetween 25-30% lean when Idling fairly smoothly, I still could not bring it off idle, fast or slow, when trying too, the exhaust lambda reading went to 80% lean, when it didn't die out completely before it could be kept running. The fuel system on this truck is returnless, the fuel spec., when converted in alldata was 63 psi. I connected my flow meter with the outlet hose into ma container and restricted, to allow some type of a measurement of flow. The pressure showed 61 psi and flow was .2 gpm, when the restriction was opened to allow .5 gpm the pressure dropped to 50 psi. At this time I recommend a fuel pump and filter with a potential check of pwr. and ground through the sender and suggest sending the inj.'s out for cleaning.The job was approved and completed, with a result that wasn't good. Basically the truck ran the same with the exception that it took less time for it to be able to idle and could be snap throttled now without dying. Looking at fuel trims, O2's and lambda, this truck was still running very lean. Since I can now snap throttle I look at MAF sensor waveform, not good, replaced MAF sensor and finally the truck is fixed.
Automotive Test Solutions is a multi-national award winning company for innovative thinking that produces patented tool solutions for the automotive industries. ATS currently holds 22 patents with over 25 patents pending. All of the tools produced at ATS are designed to allow technicians to quickly and accurately diagnose the modern vehicle. ATS tools offer unique solutions to help technicians where it counts, in your service bays. Established in 2001, ATS manufactures; oscilloscopes, ignition analyzers, OBD II scan tools for advance engine diagnostics, misfire detection systems, advanced engine mechanical testing using pressure transducers, pressure transducers, advanced leak detection systems, tailpipe emission gas analyzers, fully articulating borescopes, engine simulators, carbon removal solutions for induction systems, oil and fuel pour-ins to serve the automotive technician.
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