My 1999 Honda Accord starts up and will idle roughly and when you hit the gas pedal the car will bog down until the gas pedal is pumped and the tach reads about 1200rpm and then it begins to increasesgradually. When the tach is between 4-5000rpms the tach begins to bounce back and forth, While driving the car it takes about 2.5 miles to reach 50mph and it makes a hissing noise under the hood by the furl injector manifold. I have replaced the entire ignition w/ exception to the switch and have run a tank of gas mixing the proper amount of Lucas fuel system cleaner. I am at a loss of what is wrong with the engine a need help. Anyone have thoughts on the problem?

SOURCE: 1986 Accord - fuel pump relay problem - HELP!

Just replace a fuel pump myself and had the same problem. I found that the wires going to the pump inside the tank where grounded out. While setting the pump in the tank I got the wires pinched between ths tank and the cover. Hope this helps.

SOURCE: '95 Honda Civic EX will not start after cleaning fuel injectors

I would talk to who cleaned the injectors, I don't know if it something they did or not. It could be a stuck open injector. The exhaust would have a raw fuel odor if it was. What it sounds like is a blown headgasket, which can just happen. The exhaust would have a sweet smell to it. Usually starts as a small leak (between cyl. 2 & 3), the engine burns the coolant while driving which you don't see. Then the coolant level gradually drops to a point where the car overheats, which warps the head, causing a large leak. Now you see the coolant burning (white smoke).
Good luck Honda Al

Testimonial: "Thank you so much for your help. I did find out the problem. I had a bad distributor cap and rotor. Got it fixed and now the car runs fine."

Ned C Cook

• 3433 Answers
• Posted on May 22, 2009

SOURCE: running rough, wont idle, bad gas smell

Possible injector failure. locate by disconnecting injectors one at a time. The one that makes no change is the questionable. Status of spark plugs need chkg also. pull the plugs an the one that looks washed is questionable good luck

SOURCE: IDLING PROBLEMS ON 1992 ACCORD EX

Have the Idle Control Solenoid Valve cleaned up.

Or it might be defective. See steps below to check...

1. Disconnect idle control solenoid valve electrical connector.
2. Disconnect upper hose to solenoid valve from manifold and apply vacuum to hose. Valve should hold vacuum.
3. Continue applying vacuum to hose and briefly energize valve by connecting battery positive terminal to the black/yellow wire terminal and negative battery terminal to the green/black wire terminal. Valve should not hold vacuum when energized.
4. If idle control solenoid valve fails to perform as outlined, valve is defective.

SOURCE: I own a 90 honda

Try to check out the Idle Air Control Valve, it could be dirty or defective and the vacuum lines if they are not leaking. If that does not solve it have the Fast Idle Thermo Valve checked.