fuel pressure problem, maybe..help?
my 86 NA has been running like a champ for a while and now when I give it heavy throttle when it gets past 3400 RPM it goes to 10:1 AFR.
I thought it was a sticking injector so I switched them out with an extra working pair and ohmed out all 3 pairs of them and they all came out within spec and switching them around a few times still didnt fix it. under light load I can get up past 6krpm and get normal AFRs in gear, the car revs past 3400rpm under heavy load/wot but its 10:1 afr to maybe 11:1, its not like it bucks and wont get past 3800 like a hesitation issue, which my car does not have. the fuel pump is only 2 years old, the previous owner installed a walbro 255lph fuel pump. my grounds are clean I have new spark plugs I checked the TPS and its in working order all my sensors are fine according to my code checker 02 sensor is my 5 wire bosch that is part of my AEM UEGO I have a feeling it might be the injector driver within the ecu (but I dont have a spare to test) or it might be the FPR but the FSM wants me to test fuel pressure with a multi line tester :sadwavey: but is there a way to test it without that fancy tool, like just a regular fuel pressure tester. help? |
oh and I forgot to mention when unplugging the secondaries the 3400rpm 10:1 afr still occurs.
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I dunno if this is normal or I am just noticing it now but when I let off the gas (like 0% throttle) it goes richer before it goes lean, if that helps at all.
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