Flat spots on cam?
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From: Vancouver WA
Flat spots on cam?
OK, so I've been having a rough idle problem the last few weeks. No codes. Changed all the usual tune-up type stuff. No improvement. Since I get a discount because my daughter works at a dealer, I finally broke down and took it in.
What I get told is fuel injectors are dirty and need to be cleaned. Fine. MAP sensor is way out of range. OK, fine. He says all the plugs like fine. I know, I just changed them, but the old ones looked fine too. He says the rest of the basic stuff looks good. Then he tells me my compression is at about 150 PSI, but he's pretty sure my cam has some flat spots on it. Huh? I've only had the truck since last July, and it's run great until this rough idle thing started a few weeks ago. I of course have no way of knowing how the truck was treated before. I'm assuming it was used to either tow or haul some fairly heavy weight considering the overload leafs AND the coil-over shocks on the back.
Has anyone else had a problem with cam lobes flattening out, but the engine still seems to run OK? I guess I'm just going to have to see if the MAP sensor and cleaning the injectors smooth out the idle.
What I get told is fuel injectors are dirty and need to be cleaned. Fine. MAP sensor is way out of range. OK, fine. He says all the plugs like fine. I know, I just changed them, but the old ones looked fine too. He says the rest of the basic stuff looks good. Then he tells me my compression is at about 150 PSI, but he's pretty sure my cam has some flat spots on it. Huh? I've only had the truck since last July, and it's run great until this rough idle thing started a few weeks ago. I of course have no way of knowing how the truck was treated before. I'm assuming it was used to either tow or haul some fairly heavy weight considering the overload leafs AND the coil-over shocks on the back.
Has anyone else had a problem with cam lobes flattening out, but the engine still seems to run OK? I guess I'm just going to have to see if the MAP sensor and cleaning the injectors smooth out the idle.
Thread Starter
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Posting Guru
Joined: Jul 2002
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From: Vancouver WA
Flat spots on cam?
No popping or anything like that. It has just been shaking at idle. Actually, even while driving when the RPM's are under 1500 or so you can still feel it. Anything over that and it's just as smooth as ever.
I thought the engines were roller by '95 also. Does anyone know for sure?
I thought the engines were roller by '95 also. Does anyone know for sure?
Thread Starter
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Posting Guru
Joined: Jul 2002
Posts: 2,205
Likes: 1
From: Vancouver WA
Flat spots on cam?
Well, so now they say the cam is fine, but I have a vacuum leak in the intake manifold gasket.
And no, the MAP sensor and cleaning the fuel injctors didn't help at all.
And no, the MAP sensor and cleaning the fuel injctors didn't help at all.
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