Nearly all the things that could limit the maximum revs of a mechanical unintentional nature would probably cause the power to reduce as the maximum rpm is neared so acceleration would similarly reduce and if climbing a hill the maximum would never be reached.
If your description is accurate and the engine produces normal power to 3800 without tapering and won't go any further it is something only electronic rpm limiting is capable of rather than the usual culprits of strangled intake, strangled exhaust, insufficient fuel or timing problems. Sometimes it was something as simple as the throttle butterfly not opening fully.
Checking the injectors is only half the testing the fuel system should have - the fuel pressure and delivery volume and regulator function needs to be checked.
Opel once made an engine of 1.4 litre and over time it was stretched to 2.0 litres and beyond. That engine pulled strongly until it reached a ceiling of about 5400 rpm, less for a high mileage model. It was impossible to make the intake ports large enough or to maintain a sensible shape to the ports which made the rpm self limiting and was my only experience of what you describe in over 40 years. In all other cases of limited rpm the power always tapered because of external faults.
SOURCE: ENGINE MISSING ABOVE 3800 RPM
no the code is most likely from a dpfe sensor for you egr system not the egr valve itself.a clogged fuel filter though might cause your low revs
SOURCE: 2000 corolla sluggish when accelerating, fine at higher RPMs
Try changing out your distributer cap and rotor button. Let me know if that solves your problem.
Thx
SOURCE: 1999 Grand Am 3400 v6 misfire.
I was asking about the pushrods because I had this problem with one of these engines that had a bent push-rod. I robbed a push-rod out of an older 3100 and it was just a fraction of an inch longer which bottomed out the lifter. I figured it out by removing the valve cover and loosing the rockers when it was running and it smoothed out. I'm guessing you checked for vacuum leaks already. How about injection pulse on the number 6 cylinder when running. Another thing you could check is running compression. You said you checked compression but did you just check cranking compression or did you check running compression too.
SOURCE: 2000 gmc jimmy 4.3L misfire on cyl 4 and cyl 5 at
Clean the egr valve which would cause rough ideling and misfire........Hope this helps u out.
SOURCE: Galant 4G63 Non Turbo 2.0 Litre 1988 ... has bad
sounds like its breaking down, check your ignition system, test your leads, check your plugs, check your ignition coils etc etc etc.
Testimonial: "Proof in the pudding - the engines performance has totally changed with a simple but hidden leak in the intake manifold area ( now sealed ) ."
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