Question about 1986 Chrysler Fifth Avenue

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86 fifth ave.. poor gAS mileage.. dies when cold in gear.. strange popping sound in exhaust system.. just passed smog too..

Carb rebuilt.. new plugs new wires 91 octane always in tank.. passed smog with float replacement..

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Check and adjust auto choke setting on carby.

Posted on Apr 21, 2013


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Posted on Jan 02, 2017

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SOURCE: 1984 chry fifth ave run out off gas week later

check the fuel filter to make sure it is open/clean also check the fuel pump pressure to make sure it is okay? check for air leaks in the fuel lines for lose hoses connections and fuel it getting to the throttle body

Posted on Jan 21, 2010

SOURCE: My fifth ave hessitates and bucks on acceleration

How is the EGR Valve?
What is causing the issue, is the higher vacuum
signal when you get on the gas.
Use that and theory to figure it out.

Posted on Nov 25, 2010

  • 79 Answers

SOURCE: need wiring diagram for 91

Try looking it up here - this is a pretty good source for info when you get stuck on a repair.

Posted on Jul 12, 2011

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86 4.3 4BC 1500 Chevy Die rolling up to light Started up and ch of fuel and it died 3 times now no start smell fuel and quit yellow spark Have replaced cap rotor plugs wires EGR coil ECM Rebuilt carb

It sounds more like a fuel problem to me then a bad coil or spark ign the spark should be blue but its hard to see in daylight
You say you rebuilt the carb are you sure your main mixture jets are at least 2 to 3 turns out off the stops .
Try pouring fuel down the barrel fill the float bowl if it runs then dies its fuel don't let it catch unfire you should have 45 sec. of run time then adjust the the mixture screws 2 turns is base but when its is running good turn them in 1 at a time and give it 30 sec. to adjust until it starts to stumble then back it out a 1/4 two 1/2 turn then repeat on bank 2

Nov 23, 2016 | Chevrolet Cars & Trucks

1 Answer

Failed emissions hc high

First I recommend changing spark plugs, air filter, and change the oil & filter. If these are dirty or fouled up it will kill your millage and help to fail smog.
You can reduce both NOX and CO emmissions by adding denatured alcohol to the gas tank. Run it down to a bit under 1/4 tank and add 1 1/2 gallons. It makes the engine run a bit rough, but really clean.
If you still fgail SMOG then you need a new catalytic converter.
I used to "trick" my 86' with alcohol, but just rebuilt the engine so I put a new Cat on it. It passed emissions with WELL BELLOW numbers.

Good luck.

Aug 08, 2014 | 1991 Toyota Pickup

1 Answer

1986 Toyota new rebuilt motor won't pass smog at

It depends which emission you are failing on but I suspect that it is either CO or NOx. If it is NOx, then it is quite possible that you have a problem with your EGR valve or the ignition timing is incorrect. If you failed CO, you may have a dirty air filter or indeed, a bad carb, but I would need to know the actual gas and readings to be certain.

Jun 09, 2011 | 1986 Toyota Pickup 4WD

1 Answer

I purchased a F250 that has a 460 engine/ 4 barrel carb system in it. Do you have any suggestions on getting better gas mileage?

Tune ups on a regular basis are a must. A couple times a year check the plugs and replace if they are a little bit dirty. Also air filter. Keep the carb in tip top shape, tuned and rebuilt as necessary. Install an aftermarket vacuum guage in the dash where it is easily readable. They come marked with ranges to indicate good or poor mileage. It just plugs into the vacuum lines on the intake or carb. The more you keep it in the good range the better the mileage. Driving habits will be your best bet,keeping off the 4 barrel. Hope this helps.

May 02, 2010 | 1984 Ford F 250

2 Answers

86 5th ave lacking power to drive faster than 40km/h

Sounds like your cat converter has become clogged from diesel....take it to a smog tester to see if cat is bad

Jun 27, 2009 | 1986 Chrysler Fifth Avenue

1 Answer

Poor mileage, runs rich, fails smog

As it uses a carburettor, set the main jet adjustment to run leaner.

Mar 18, 2017 | 1983 Chrysler Cordoba

1 Answer

1990 isuzu tropper

Since I no longer live in California, I don't care what you do but your problem sounds like the EGR system and if they replaced the valve, it isn't working, probably stuck open. This allows exhaust gases to invade the engine when it can't tolerate it; that path should only be open when the engine isn't pulling hard or at an idle. That widget also costs gas mileage so I always stuck a ball bearing or a screw into the vacuum hose that controls it disabling it so it never opened. On some vehicles that can give back 10-15% of your lost gas mileage. However, if the valve is stuck open, plugging the hose won't help at all.   

May 05, 2009 | 1990 Isuzu Trooper

1 Answer

Engine rough idle cold. passes smog once temp reaches thermostat

you can take apart the top section and blow out the small passage that's bellow the throttle plate.

May 01, 2009 | 1987 Toyota Tercel Liftback

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