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91 prelude si b21a1 running rich

 
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Old 10-04-2012, 11:05 PM
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91 prelude si b21a1 running rich

So basically my 91 prelude si with a b21a1 motor is running rich. Bought the car and guy said motor was rebuilt about 98,000 miles prior. I replaced the injectors, ignition coil, plugs and wires, cap and rotor and having timing belt redone bc it was supposedly off a tooth according to my buddies shop. They did belt and still ran like **** and they r re doing it again. What other reasons would keep the car running rich? No check engine light either
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Old 10-05-2012, 08:29 AM
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Re: 91 prelude si b21a1 running rich

Don't know how you came to the conclusion that it's running rich unless black smoke is coming out of the exhaust or the exhaust smells like an old car from the 60's. Since you don't have any codes, Then I'd say the valves aren't adjusted right, the timing is way off and retarded too much, or there's no catalytic convertor installed.
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Old 10-05-2012, 11:17 AM
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Re: 91 prelude si b21a1 running rich

Prelude running rich? Shocker. If you have 37-45lbs pressure at the filter, its rich. The regulators safeguard lean conditions from Honda. And do you have a perfect running 91 prelude to make the comparison to? Definitely check your catatlytic converter. No amount of timing will change the fuel pressure of the car. You could get a manual fuel regulator kit that you'd have to hack up your current regulator to put a pressure screw on, and adjust the pressure, but honda made it rich for a reason.

What were the colors of the four spark plugs?
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SURGEON GENERAL WARNING:
THE IMITATION OF ANY OR ALL MANEUVERS EXECUTED BY A BA B20A 4WS PRELUDE IS HAZARDOUS TO YOUR CAR'S HEALTH. DRIVING A PRELUDE MAY CAUSE LOSS OF INTEREST IN OTHER CARS, WOMEN AND SPEED LIMITS. OTHER SYMPTOMS INCLUDE SLEEPLESS NIGHTS, COLD SWEATS AND OTHER SYMPTOMS RELATED TO ADDICTION. IF THE SYMPTOMS PERSIST,DRIVE!
Prelude: Because all great stories have one. Just like Honda.
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Old 10-05-2012, 09:31 PM
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Re: 91 prelude si b21a1 running rich

It's running rich based on it not passing smog and was told its rich. I'm thinking it might b the fpr or a hallowed out cat. But not exactly sure bc I've done so damn much to the car already. Just trying to figure it out at this point so it will pass smog.
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Old 10-05-2012, 09:32 PM
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Re: 91 prelude si b21a1 running rich

The plugs were black on cylinders one and three
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Old 10-05-2012, 09:53 PM
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Re: 91 prelude si b21a1 running rich

I would recommend a seafoam treatment before taking any more costly repairs. You have to inspect the PCV valve, EGR and seafoam can usually clear those out and bring you closer to passing.

This is the kit im talking about, also get a fuel pressure gauge to read your your new pressures.

http://www.ebay.com/itm/BLOX-FPR-B18...abed8c&vxp=mtr

The whole setup should be about $75. Search b18 fuel pressure gauge, it will fit on the fuel filter.
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Quote:
SURGEON GENERAL WARNING:
THE IMITATION OF ANY OR ALL MANEUVERS EXECUTED BY A BA B20A 4WS PRELUDE IS HAZARDOUS TO YOUR CAR'S HEALTH. DRIVING A PRELUDE MAY CAUSE LOSS OF INTEREST IN OTHER CARS, WOMEN AND SPEED LIMITS. OTHER SYMPTOMS INCLUDE SLEEPLESS NIGHTS, COLD SWEATS AND OTHER SYMPTOMS RELATED TO ADDICTION. IF THE SYMPTOMS PERSIST,DRIVE!
Prelude: Because all great stories have one. Just like Honda.

Last edited by Sideswipe SI; 10-05-2012 at 09:59 PM.
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Old 10-05-2012, 10:06 PM
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Re: 91 prelude si b21a1 running rich

I will try the sea foam treatment and see what happens. The pcv was replaced already. If sea foam doesn't do the trick what do u think is going on?
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Old 10-05-2012, 11:00 PM
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Re: 91 prelude si b21a1 running rich

Mine fails emissions every year so I retard the timing where it runs rich . The NOx passes after that cause it's running rich which cools down the combustion temp. The Hc goes way up close to failing though. That might be why you're failing. That means you're not burning all the gas. The catalytic convertor is supposed to burn off any extra hydrocarbons.Get a new cat but first check the timing.
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Old 10-05-2012, 11:07 PM
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Re: 91 prelude si b21a1 running rich

By the way, Seafoam stays in the fuel system. The pvc valve and the egr valve open and closes off air. So you see that seafoam is nothing but a fuel additive to clean out the fuel system only. Maybe it helps clean off the valves.
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Old 10-05-2012, 11:13 PM
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Re: 91 prelude si b21a1 running rich

Wait, you mean if you add the seafoam through the power booster vaccuum connection, and gas tank, it won't reach the pcv or egr? Did not know that, and honestly, it easier to pass the car as a truck, in NY anyways. Only my celica supra needed it tho.
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SURGEON GENERAL WARNING:
THE IMITATION OF ANY OR ALL MANEUVERS EXECUTED BY A BA B20A 4WS PRELUDE IS HAZARDOUS TO YOUR CAR'S HEALTH. DRIVING A PRELUDE MAY CAUSE LOSS OF INTEREST IN OTHER CARS, WOMEN AND SPEED LIMITS. OTHER SYMPTOMS INCLUDE SLEEPLESS NIGHTS, COLD SWEATS AND OTHER SYMPTOMS RELATED TO ADDICTION. IF THE SYMPTOMS PERSIST,DRIVE!
Prelude: Because all great stories have one. Just like Honda.
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Old 10-06-2012, 02:46 PM
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Re: 91 prelude si b21a1 running rich

If I remember correctly I was told that the car was inputting too much fuel but wasn't burning all of it so most likely maybe it is the cat that is failing me. Was gonna check that out as well. What is the best way to add the seafoam to the car? I asked a buddy of mine and he said the timing through the distributor may be off as well
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Old 10-06-2012, 11:07 PM
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Re: 91 prelude si b21a1 running rich

The directions come on the can, and youtube "seafoam". The only way to find out about your distributor is to take it apart yourself.
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Quote:
SURGEON GENERAL WARNING:
THE IMITATION OF ANY OR ALL MANEUVERS EXECUTED BY A BA B20A 4WS PRELUDE IS HAZARDOUS TO YOUR CAR'S HEALTH. DRIVING A PRELUDE MAY CAUSE LOSS OF INTEREST IN OTHER CARS, WOMEN AND SPEED LIMITS. OTHER SYMPTOMS INCLUDE SLEEPLESS NIGHTS, COLD SWEATS AND OTHER SYMPTOMS RELATED TO ADDICTION. IF THE SYMPTOMS PERSIST,DRIVE!
Prelude: Because all great stories have one. Just like Honda.
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Old 10-07-2012, 01:00 AM
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Re: 91 prelude si b21a1 running rich

I think u loosen bolts on distributor and rotate it to adjust the timing. We will see what happens.
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Old 10-07-2012, 07:59 PM
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Re: 91 prelude si b21a1 running rich

The pvc valve is still allowing air to go from the valve cover to the intake source. It doesn't go to the valve cover. Secondly, The air that goes to the egr is straight exhaust gasses. It's regulated by one vacuum hose which only pulls vacuum in one direction. The only way seafoam can reach the pvc valve is if you introduce it into the valve cover somehow. Brakebooster? Can't remember where it draws air from but if it does go in the valve cover directly then yes it will be drawn though the pvc valve. Cheaper ...Seafoam or pvc valve. Still doesn't get to the egr valve.
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