QuestionI want to make sure you are talking about the 2.7L. Are there are 2 manifolds on that vechical?
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1. The check engine light came on and then it went out several times. When I had it tuned up and the light went out.
2. The engine does idle normally. When I step on the gas it bogs down and I get to about 1 to 2 RPMs nothing higher than that.
3. The car starts normal. When I put it in neutral it still bogs down.
4. The engine runs smoothly when it idles. After I step on the gas it runs rough. sometimes.
5. I drive the car I only can get to 20mph so I think that is about 1RPM if that.
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My question is that my car will not go over 20mph. I changed the fuel pressure regulator, plugs, spark plugs, fuel filter and fuel pump. I put sea-foam to clean my injectors. And I am having the same problems
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Before any more repairs are done, we should try to establish what sort of problem you're having. This could be engine or transmission related.
1. Is your check engine lamp on?
2. Does your engine idle normally?
3. Does your engine rev normally in neutral?
4. Is your engine running rough?
5. Are the engine rpm's consistent with vehicle speed for the gear you're in while driving?
Also, please tell me what engine you have, whether the transmission is manual or automatic, and how many miles are on the vehicle. I may have additional specific recommendations of things to check depending on which engine you have.
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I'd suspect that one or more of your catalytic converters is clogged. If your vehicle was misfiring and you drove it for a significant distance while misfiring, there's a good possibility that it damaged the converter on the same engine bank as the misfiring cylinder. You might try loosening the exhaust manifold nuts and to allow some space between the manifold and head and see if you can then rev up the engine. (Don't drive it like this. It has the potential of putting a lot of heat into things that cannot take it. Just rev it a time or two to see if allowing the exhaust to breathe solves the problem.)
AnswerThe information I gave was generic because I didn't know what engine you had. There is a catalytic converter made into each of your two exhaust manifolds, and one further back in the exhaust.
But since it'll be such a pain to take the manifolds loose on this vehicle, you may want to check fuel pressure first. The symptoms are also somewhat consistent with low fuel pressure (although a tune-up shouldn't have fixed anything if that were the cause).
You might also wish to check to see tha the camshaft timing is correct. Your reported symptoms don't exactly match what I'd expect, but again, removing the upper timing cover is much easier than loosening the manifolds.
