Hi
I have a 93 f150 4x4 Flareside, short box with a 351. About March-April of this year it started problems.
Sometimes it would idle around 2500 rpm’s and I could do nothing to make the idle drop to normal. It would do this with the engine hot, engine cold, it might run right for 2 or 3 days or it might idle high for a week. It was totally random weather or not it was going to run right. Sometimes it would do just the opposite, it would idle so low it would barely run. It did not seem to be missing but at times would feel like it lost power.
I’ll give you a run down of what I did:
1. Replaced the Idle air control – No change
2. Replaced the plugs, cap rotor and wires, pcv valve, air filter and breather filter – No change (doubted this was the problem but that stuff need done anyhow).
3. Checked around the engine compartment for vacuum leaks – couldn’t find any
4. Replaced the EGR valve and Air injection pipe (runs from egr to manifold) – Problem solved the truck has ran great all summer until now, it is doing the exact same thing again.
Today I went out and took the EGR valve off to inspect it, it is moving freely and looks clean. But I noticed the Air injection pipe, when it is disconnected from the egr valve moves quite freely where it connects to the manifold.
Should this not do that? I would think that should be an air tight connection.
When I was changing the EGR valve in the spring, I broke the old Air injection pipe. When I took a look at it I could see the shiny metal where I broke it, but I could also see some dirty corroded metal on the break as well, like it had already been cracked before I got to it. I was convinced that was my problem and not the egr valve its self.
Do you think I’m right, should I take off/replace the Air injection pipe again?
I have a 93 f150 4x4 Flareside, short box with a 351. About March-April of this year it started problems.
Sometimes it would idle around 2500 rpm’s and I could do nothing to make the idle drop to normal. It would do this with the engine hot, engine cold, it might run right for 2 or 3 days or it might idle high for a week. It was totally random weather or not it was going to run right. Sometimes it would do just the opposite, it would idle so low it would barely run. It did not seem to be missing but at times would feel like it lost power.
I’ll give you a run down of what I did:
1. Replaced the Idle air control – No change
2. Replaced the plugs, cap rotor and wires, pcv valve, air filter and breather filter – No change (doubted this was the problem but that stuff need done anyhow).
3. Checked around the engine compartment for vacuum leaks – couldn’t find any
4. Replaced the EGR valve and Air injection pipe (runs from egr to manifold) – Problem solved the truck has ran great all summer until now, it is doing the exact same thing again.
Today I went out and took the EGR valve off to inspect it, it is moving freely and looks clean. But I noticed the Air injection pipe, when it is disconnected from the egr valve moves quite freely where it connects to the manifold.
Should this not do that? I would think that should be an air tight connection.
When I was changing the EGR valve in the spring, I broke the old Air injection pipe. When I took a look at it I could see the shiny metal where I broke it, but I could also see some dirty corroded metal on the break as well, like it had already been cracked before I got to it. I was convinced that was my problem and not the egr valve its self.
Do you think I’m right, should I take off/replace the Air injection pipe again?
