1998 Honda Insight Repair Question
Low compression 98 Prelude
DON'T TAKE OFF THE HEAD YET! Actually 160 is pretty good compression. Oil the cylinders and see how much increase. That engine will run fine with 100 pounds. Insure you don't have a rich misture washing down the cyls. All that done ---
It sounds like a vacuum leak. The Brake boosters are a prime suspect on that model. Also check for throttle body build up. They are bad about that. Clean it good with the throttle open on the upper and lower parts. Use a good carb cleaner and a stiff tooth brush. Wipe as much of the residue as you can before starting. It will run crappy for bit until it clears it's throat.
Let me know
the car itself has 54,800 miles on it. I replaced a motor once already at 52,000 miles due to a burnt piston ring (nitrous). The compression tester I rented today is garbage, the end spins rather than being fixed so you can spin it into the head. When I first got the car (a year and a half ago, with 42,000 miles) the compression was all around 210 (+-5psi) it is high compression (10:1) so with a lower reading it would appear normal. Everything about the motor is clean, I keep it in good condition, so there is no buildup whatsoever. The car will idle (rough) for the first minute when it is cold, then rpms drop to about 500 and then it stalls, so I have to keep on the gas. Also there is no check engine light. Anytime I've had problem with vacuum leaks (like cruise control for example) it would throw a CEL and run choppy/stall. Once it hits 3000+ rpms it runs almost normally, and VTEC kicks in at 5200 and climbs to about 6000 where I stop pushing it (redline is at 7200). The problem is running rough below the 3000 mark. I poured a capful of oil into each cylinder hoping to get a wet compression test, but unfortunately the compression tester sucked, so I just started it up, and even though it was warm, it stayed running (smoking from the oil though) and actually ran way better than normal. I'm fearing the worst....
1 question asked
Humm, have you tried running through a valve adjustment? Engine cold less than 100F, Intake should be .010 (.26mm) and exhaust should be .012 (.30mm) With those high revs you might have precussed the valves causing them to tighten- Let me know
when i first got the motor in and running, it had obnoxious ticking so i had the valves adjusted about a week before it died...maybe something to do with premature failure? ...it would be sweet if all i had to do was readjust the valves...
1 question asked
I would try that first, I think the tech might have tightened them too tight. It is easy to tigten the nut and the valve adjuster will make another turn. They run at almost 0 lash when the engine is warm. It's worth a try. Good luck