I have a 1990 Fleetwood Bro., 5.7L 357, dual exhaust flowmaster. When I crank it up black smoke comes out the exhuast pipes. I was told that my car was burning too much gas. When I hit the throttle it burst out a big puff of black smoke. What could be the problem? When i begin driving i have no problem with acceleration but when I let my feet off the gas petal it seems the car rpm just drops. If there is anyone out there with some helpful info please let me know.
Gas problem!
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Are you getting any codes / do you know how to check the codes? Tell us about the dual exhuast! Is it true dual? Have any pics of it? Check the vacuum hoses on the engine first, we had a member with your same problem, but much worse. It was the vacuum hose that goes from the throttle body to the MAP sensor, had a hole in it.
With the engine running, hold down "warmer" and "off" at the same time for a little while. The climate control display is gonna start to look crazy and do some things. Wait until it stops changing. Now hit "hi fan" once to see "01" on the display. You're in the engine code mode right now. Now, just hit the "outside temp" button to display a code. Hit it again to see if you have more codes. If you press it and all you see is "00," you have no codes. Good luck!
Oh yes, vacuum hose is very easy to install. You just go to the parts store or Fleet Farm and ask for it. They ask you how many feet you need. It comes in different sizes, from 1/4th inch to 1/2 inch. They also sell fuel line. Fuel line can be used as vacuum line but vacuum line cannot be used as fuel line. Have you checked your vacuum lines?
Alright, let's start from the top. To do an engine once-over, you'll need to get your hands a little dirty, and be on the lookout for anything that looks unusual or out of place. Start by checking all of the vacuum hoses. You have several to check. Get in close with a trouble light and look for cracks and rotting. Run your hand along the entire length of hose, feeling for anything unusual. The hose should feel smooth and rubbery, like a tire, but much more flexible. If it feels dry, rough, spongy, or cracked, it needs to be replaced. Do this with all of the vacuum hoses.
Check a few spark plugs. You don't need to do them all, since 4 are fed by one injector, and the other 4 are fed by the other injector. The plugs on the driver's side are easy to get to. Check them for any signs of problems in the engine. Take 2 or 3 sparkplugs inside to your computer. Go to this website
http://www.fitchfuelcatalyst.com/techinfo/tuning.html
and scroll down. This will teach you how to read your sparkplugs with good pictures. Check the routing of all the plug wires to their respective plugs. Remove the plug wire from the plug, and look inside with the trouble light. If the inside of the plug wire is corroded or broken, it needs to be replaced. Make sure the boot is firmly seated on the plug. This is the firing order. Make sure all the plug wires go to the right plug.
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Start with this, let us know what you find. Check the codes as well and we can tell you what they mean. You might just need a good tune-up, in which case, we can help you with that as well. Good luck!
Check a few spark plugs. You don't need to do them all, since 4 are fed by one injector, and the other 4 are fed by the other injector. The plugs on the driver's side are easy to get to. Check them for any signs of problems in the engine. Take 2 or 3 sparkplugs inside to your computer. Go to this website
http://www.fitchfuelcatalyst.com/techinfo/tuning.html
and scroll down. This will teach you how to read your sparkplugs with good pictures. Check the routing of all the plug wires to their respective plugs. Remove the plug wire from the plug, and look inside with the trouble light. If the inside of the plug wire is corroded or broken, it needs to be replaced. Make sure the boot is firmly seated on the plug. This is the firing order. Make sure all the plug wires go to the right plug.
Start with this, let us know what you find. Check the codes as well and we can tell you what they mean. You might just need a good tune-up, in which case, we can help you with that as well. Good luck!
You, my friend, have 02 sensor problems. Code 44 indicates oxygen sensor ciruit lean. Code 45 indicates oxygen sensor circuit rich. Code 32 is an EGR malfunction code. Replace the Oxygen sensor. Take the EGR valve off and clean it well, test it if you want to keep it. If you'd rather just buy a new one, that's an option too. Good luck!
Alright, the EGR valve is on the intake manifold, next to the throttle body. It's round, about 3 inches across, and has a vacuum line going into it. It sits at a bit of an angle, but you should be able to pick it out. It's on the right side of the throttle body, and back just slightly. The codes 44 and 45 mean you have a problem with the 02 sensor.
There's only one hose going into the EGR valve itself. It enters on the top. It looks kind of plasticky, but it's a vacuum hose nonetheless.
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