1998 Dodge Ram i need a diagnosis

1998 DODGE RAM
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MHENRY_72
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Engine Performance problem
1998 Dodge Ram 4 cyl Two Wheel Drive Automatic
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im not quite sure if it is the engine or not,
but i get to 20mpr [25 at most] and it will rev up to just about 3000rpm but will not go any faster. if i do try to go any faster, the engine makes a rattling noise.
the engine is overheating enough to make the water boil, but it idles just fine.
the oil and everything in it is just fine.
do you have any ideas of what could be wrong??

please and thank you.
Aug 23, 2008 at 12:37 AM
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RASMATAZ
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An engine that is overheating or a stuck closed EGR valve will cause the engine to ping/detonate that's the rattling noise you're hearing.

but i get to 20mpr [25 at most] and it will rev up to just about 3000rpm but will not go any faster. Have the Knock sensor checked out could be that its not retarding the timing when pinging is occuring.
Aug 23, 2008 at 12:52 AM