327 rough idle bucking under load
01-10-2019, 12:20 AM
#1
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327 rough idle bucking under load
I have a 1993 Ford F-150 that has been idling rough and bucking at low rpms when pushing in the accelerator and symptoms get worse as truck warms up, also consistently getting code 327 evp low voltage. So far I have changed plugs cap and rotor, fuel pressure regulator, fuel filter, air filter, maf sensor, looked at and inspected EGR valve and sensor (found nothing seemly wrong with ither) also no detectable vacuum leaks! I’m truly stumped and symptoms are growing worse fast! I’m not sure what else to check other than taking the intake manifold off and cleaning any carbon build up which I’d rather not do! Any other ideas before I have to go that route?
thanks
thanks
01-10-2019, 01:47 PM
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Stop replacing parts. If you still have the originals, you should think about putting them back on since there's apparently nothing wrong with them, and they're probably higher-quality than any replacements.
For any fault code, the first step is: CONFIRM that the indicated condition actually exists. Did you? Is the EVP voltage low?
For any voltage problem, the first step is: CLEAN & tighten every terminal on the heavy battery cables (at the battery, starter, starter relay, body, block, & frame. Click these & read the captions:
(phone app link)
(phone app link)
BTW
A '93 doesn't have a MAF; they're all MAP engines.
(phone app link)
(phone app link)
For any fault code, the first step is: CONFIRM that the indicated condition actually exists. Did you? Is the EVP voltage low?
For any voltage problem, the first step is: CLEAN & tighten every terminal on the heavy battery cables (at the battery, starter, starter relay, body, block, & frame. Click these & read the captions:
(phone app link)
(phone app link)
BTW
A '93 doesn't have a MAF; they're all MAP engines.
(phone app link)
(phone app link)
Last edited by Steve83; 01-10-2019 at 01:49 PM.
01-14-2019, 06:48 PM
#5
I have a 1993 Ford F-150 that has been idling rough and bucking at low rpms when pushing in the accelerator and symptoms get worse as truck warms up, also consistently getting code 327 evp low voltage. So far I have changed plugs cap and rotor, fuel pressure regulator, fuel filter, air filter, maf sensor, looked at and inspected EGR valve and sensor (found nothing seemly wrong with ither) also no detectable vacuum leaks! I’m truly stumped and symptoms are growing worse fast! I’m not sure what else to check other than taking the intake manifold off and cleaning any carbon build up which I’d rather not do! Any other ideas before I have to go that route?
thanks
thanks
