ltnguyen

Engine sputter upon acceleration on gas paddle!!! --Help--

I brought it to 4 different mechanics already

Thanks in advance for your helps!
I got a Honda Prelude 97 w/ VTec (Automatic) only 67,000.00 miles. I did a major tune up at 60,000.00 miles (new timing bells, new spark plug, new transmission oil, new air filter). The car was running fine until couple of weeks ago. The engineer start to sputter (vibrate) when you increase on the gas paddle, but it would stop if I keep it on a constant speed. It only doing it when increase on the gas paddle and occur after driving it for around 10 – 15 minutes, and drive above 50 miles/hr.
***(It work fine if keep at a constant speed, only occur when accelerate on gas paddle)
I already tried the following:
1. Gas treatments and treated it twice already and it still doesn’t work because I thought it may be water in my gas tank.
2. I also replace the fuel filter, but that still doesn’t seem to work either.
3. Checked wires, distributor, rotor and spark plugs and it look fine
4. Replace transmission oil w/ Honda transmission oil instead.
5. Bring out to a mechanic shop to hook up to the computer and check but they couldn’t find anything wrong with it because there was no engine light on.

P.S. It run fine w/ short distance (less than 10 miles).
Could it be my fuel bump that doesn’t work all the time, it too expense (around $300.00) to try?

:awais:

BigLew

Are you losing power or accelerating slow? Are you experiencing any hesitation? What exactly do you mean by "sputter"? Is your exhaust making a funny noise?

ltnguyen

Accelerating Slow, Engine start to vibrate (kind of like water in gas or engine doesn't have enought power). No funny noise for exhaust

BigLew

Since you said when you cruise at a constant speed it's fine it sounds like it could be your ignition module.

ltnguyen

Could you please be more specific?
Are we talking about ignition coil?
:thinking:

ltnguyen

How can I check to see if it the ignition problem?

BigLew

Problem is that I'd expect codes to thrown from something like this. At constant speed you say you're OK, but your ignition is not advancing correctly under acceleration causing, what it sounds like a misfire which would cause your engine to vibrate. I don't know what procedures shops have for checking for a misfire but you might want to start from there.

ltnguyen

What do you think about fuel pump or fuel presure regulator?
Do you think that could be possible?

BigLew

Fuel starvation would cause you to bog down or hesitate it wouldn't think it could cause vibration. You're problem sounds more like a misfire. But just to be sure check your you're fuel pressure that will rule that out.

neex

Did you get this solved?? I have the exact same problem but on an OBD1 Integra. I am starting to think that my fuel pump may have an intermittent problem when under load. Short of dropping the tank and investigating, I've tried everything else.

Andrew.
aka neex.

email me if you want to chat about this some more.

neex@redbull.nu