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  #1  
Old 10-09-2010, 05:40 AM
ljones ljones is offline
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Default 4cly help

Hi I have a 87 ranger, how do I know what size 4 cyl I have, it also seems underpowered even for a 4cyl, I read somthing about the catalitic converter geting clogged could that cause this, it is fule injected are there any problems with the fi system that could cause loss of power or could I just need a simple spark plug change ?
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Old 10-09-2010, 06:56 AM
sgtsandman sgtsandman is offline
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Default Re: 4cly help

There is a sticky at the top of this forum with a lot of info for you. I think you have a 2.0. None of the four bangers are power houses but they do get better as the trucks get newer.

Things that might help would be a spark plug and wire change. Cleaning the fuel system with a tank or two of fuel system cleaner. Cleaning the intake with carburator/throttle body cleaner.

It is possible that the cat is clogged but I would save that as a last resort since that can get expensive. You might have a "lazy" O2 sensor too.
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  #3  
Old 10-09-2010, 09:36 AM
ljones ljones is offline
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Default Re: 4cly help

This truck sat in a barn for 5 or 6 years so it proably needs plugs and wires. What do you mean by a "lazy" o2 sensor, is there any way I can check it ? To clean the intank would I just spay it with throtle body cleaner ?

Last edited by ljones; 10-09-2010 at 09:40 AM.
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Old 10-09-2010, 10:10 AM
mickblock mickblock is offline
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Default Re: 4cly help

If your cat was clogged your engine light would be shooting laser beams at you, it would get visibly red hot, idle would suck bad, and you might hear strange huffing noises at the tail pipe.

If you wanna change the plugs use direct replacement Motorcraft.
As in call a dealership parts dept give 'em your VIN and ask for the part number.

This'd be what I try first though. It'll cost you about ten bucks.

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Old 10-09-2010, 10:15 AM
sgtsandman sgtsandman is offline
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Default Re: 4cly help

Quote:
Originally Posted by ljones View Post
This truck sat in a barn for 5 or 6 years so it proably needs plugs and wires. What do you mean by a "lazy" o2 sensor, is there any way I can check it ? To clean the intank would I just spay it with throtle body cleaner ?
Th fuel system is probably pretty gummed up then. A couple of concentrated fuel system cleaner like Chevron Techron (up 20 gallon size) or seafoam will help. Run the tank damn near empty each time.

A "lazy" O2 sensor is one that is just within limits. It works well enough that it doesn't throw a check engine light code but poorly enough that the system doesn't work as it should. The test is to hook up a OBDII reader and get the readings then compare it to a repair manual. The problem is, your truck might be too old to have an OBDII port, maybe even an OBDI. You might have to get a Haynes manual to help you out on checking the O2 sensor, maybe it's a resistance reading with a multimeter.

There are two things you can do for the intake. Spray the crap out of the thottlebody and the butterfly plate and suck up seafoam (1/3 can) through a vacuum line. A couple of people have removed the hose from the brake booster and sucked it into the engine from there. The engine will stall. Don't worry. Start it back up and run it until the exhaust stops fogging the neighborhood.
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Old 10-09-2010, 10:19 AM
sgtsandman sgtsandman is offline
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Default Re: 4cly help

One note on the sea foam in the engine oil. There are those who recommend doing it right before an oil change. Run the engine for a few minutes and change the oil. I wouldn't leave it in there for a whole 5,000 mile oil cycle.
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1999 Honda CR-V EX, RT4WD, 2.0L, 5 Speed MT, 4.56:1, open differential
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  #7  
Old 10-11-2010, 05:19 PM
ljones ljones is offline
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Default Re: 4cly help

I went through and cleaned and replaced everything in the fuel system up to the fuel rail when I got it out so that should be good.
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