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Topic
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I’m getting power loss on my 97 EX coupe the longer I drive. If I turn it off and back on after a drive it will struggle to start then run rough for a bit and power loss will still be there. Starts fine in the morning with only a little power loss but on the way back from work the throttle gets mushy and my powerband is nerfed hard. Noticed I was burning coolant so I replaced head gasket.
Machine shop found the cam journals were chewed up, last owner must have ran oil low so I got a new head on Craigslist and it runs much smoother now but my issue remains. Installed test pipe and it didn’t help, although the extra noise is welcome(albeit ricey lol) No CEL. Coolant is holding now, no leak. Temps never go above normal, could something be overheating that isn’t measured by a sensor? Or possibly a bad sensor? At this point any help is appreciated, I want to know every possibility so I can check them all.
Ignition wire resistance seems fine. Ran it without gas cap, no difference. Going to tear down the distributor tomorrow. This gradual power loss over time (only a little power loss at beginning of drive) and rough starts that accompany it seem to be the only symptoms. Timing is fine. Belts were done 50k ago according to service history. I don’t see smoke while I drive. Could the fuel pump be weakening as it heats up? Is it possibly a cracked block? It sounds smooth. Please help!
I have an obd2 bluetooth scanner that connects to my phone, should I get a log of my drive home from work?
97 civic ex 222k miles, purchased at 217k.
Parts replaced:
-99 ex head
-oem head gasket + china intake/exhaust gasket
-new injectors (ticking gone)
-new fuel filter
-pcv valve
-plugs
-many oil changes
-oil temp sensor
-more if I remember
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Replies
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Just guessing, but it could be a flakey ignition coil. It might be borderline OK when cold, but gets progressively worse as things heat up.
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