Compression and Surging

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   All,
I'm getting an odd "surge" when I drive.  She idle's fine and revving seems to be smooth, but for the past week or so, when I drive and start to accelerate (cold or warm) I get a hesitation consistently.  I replaced the head gasket about 8 months ago and all was running fine.  I decided to test compression and got the following starting from the water pump (#1 and working back to the firewall #4)

1 - 90
2 - 85
3 - 89
4 - 90

I didn't do a wet test, only dry.  Attach the tester and crank it with the starter for a few seconds.  Check, and do it again to confirm results.

Looks like the low end of acceptable, but I'm an apprentice in this area.

Any help is appreciated.

Thanks,

-Thomas

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tufcj2a Members Profile Send Private Message Find Members Posts Add to Buddy List Member Joined: 19 Apr. 2018 Location: California Status: Offline Points: 227	Post Options Post Reply Quote tufcj2a Report Post Thanks(0) Quote Reply Topic: Compression and Surging Posted: 30 Dec. 2019 at 11:15pm
	All, I'm getting an odd "surge" when I drive. She idle's fine and revving seems to be smooth, but for the past week or so, when I drive and start to accelerate (cold or warm) I get a hesitation consistently. I replaced the head gasket about 8 months ago and all was running fine. I decided to test compression and got the following starting from the water pump (#1 and working back to the firewall #4) 1 - 90 2 - 85 3 - 89 4 - 90 I didn't do a wet test, only dry. Attach the tester and crank it with the starter for a few seconds. Check, and do it again to confirm results. Looks like the low end of acceptable, but I'm an apprentice in this area. Any help is appreciated. Thanks, -Thomas