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Ford ranger engine miss

 
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bigcman bigcman
New User | Posts: 11 | Joined: 11/05
Posted: 11/07/05
07:10 PM

I have a 1991 Ford Ranger, 2.3L engine, 230,000 miles (90,000 on engine).

Anyhow, at certain times the rpm's will drop down and it will develop a serious miss.  It sounds like a lawn mower going down the road.

For instance, lets say im goin 55 mph in 5th gear.which is usually around or below 3,000 rpm's.  All the sudden the rpms will drop down to 1500, and it will start putting along.  Then the tach will go up again and it will start running properely.  

I have changed the fuel filter, all 8 plugs, plug wires, fuel pump.  

I have been told that bad fuel could cause this, but it is happening too much to be bad fuel.  Am I losing a coil pack?  There is a exhaust leak on the manifold, could this be letting cold air into the engine?  

Any help would be greatly appreciated.  

mabfisher mabfisher
New User | Posts: 2 | Joined: 11/05
Posted: 11/14/05
05:11 PM

bigcman wrote:
I have a 1991 Ford Ranger, 2.3L engine, 230,000 miles (90,000 on engine).

Anyhow, at certain times the rpm's will drop down and it will develop a serious miss. It sounds like a lawn mower going down the road.

For instance, lets say im goin 55 mph in 5th gear.which is usually around or below 3,000 rpm's. All the sudden the rpms will drop down to 1500, and it will start putting along. Then the tach will go up again and it will start running properely.

I have changed the fuel filter, all 8 plugs, plug wires, fuel pump.

I have been told that bad fuel could cause this, but it is happening too much to be bad fuel. Am I losing a coil pack? There is a exhaust leak on the manifold, could this be letting cold air into the engine?


It sounds like your timing belt may have streched or jumped time.

Any help would be greatly appreciated.
 

bigcman bigcman
New User | Posts: 11 | Joined: 11/05
Posted: 11/16/05
10:44 AM

mabfisher wrote:


It sounds like your timing belt may have streched or jumped time.


Naw, I dont think it could be the timing belt.  Otherwise the problem wouldn't go away.  In the last 2000 miles the problem has only came up 3 times for say a total of 15 minutes total.  

radlynx radlynx
New User | Posts: 48 | Joined: 11/05
Posted: 11/28/05
10:16 AM

try using a high octane gasoline.  

Johnswiftm Johnswiftm
Enthusiast | Posts: 658 | Joined: 07/05
Posted: 11/28/05
06:53 PM

You could have dirty fuel injectors also  

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