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  #1  
Old 01-06-2013, 08:26 AM
vamwith vamwith is offline
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Default Engine won't run over 2000 rpms

Symptoms:
Engine won’t run past 2000 rpms, whether in Park, Neutral or in Gear.
Starts and idles just fine, but once you start applying gas it seems to want to start choking itself out at around 1600 rpms to the point the entire engine starts shaking and starts choking out at around 2000 rpms.

Step 1: Replaced Fuel
Truck has been sitting for several months. Heard that gasoline starts going bad after about 3-4 months. Fortunately, I didn’t have a whole lot of fuel in the tank, maybe 5-6 gallons, as the low fuel light was on. Siphoned all that I could, close to 6 gals. and replaced with 10 gals. of fresh fuel with Sea-Foam additive. No positive results!!!!!

Step 2: Parts replaced
Replaced spark plugs, wires, distributor cap, rotor and PCV, forgot how much fun this was! Noticed some corrosion on the contacts inside the distributor cap. Still no change….engine won’t get past 2000 rpms.

Step 3: Fuel pressure test results
With ignition switch on (engine not running), fuel pressure was 44 psi.
Engine running at idle (before warm-up) Needle was fluctuating rapidly between 44-54 psi.
Engine running at idle (after warm-up) Needle fluctuating between 46-48 psi.
Revving engine, needle fluctuating rapidly between 46-56 psi. I’m not understanding the rapid fluctuation of the needle, it would seem to me that it would be a gradual rise and fall of pressure.

Note: I’ve also noticed, what appears to be a hissing sound coming from the exhaust pipe, doesn’t seem to be a whole lot of pressure coming out either…….this won’t by chance mean a problem with my catalytic converter, does it? Can this cause the issue I’ve been having? Would pulling the upstream O2 sensor allow enough of the exhaust to escape to allow the engine to run properly?

I’m open to almost any suggestions, or just maybe one of you has had the same issue, as I really don’t want to have to take it to the dealer, I’d really prefer to keep my arms & legs, if you know what I mean?

Mike
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  #2  
Old 01-06-2013, 08:31 AM
Kman521 Kman521 is offline
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Default

Quote:
Originally Posted by vamwith View Post
Symptoms:
Engine won’t run past 2000 rpms, whether in Park, Neutral or in Gear.
Starts and idles just fine, but once you start applying gas it seems to want to start choking itself out at around 1600 rpms to the point the entire engine starts shaking and starts choking out at around 2000 rpms.

Step 1: Replaced Fuel
Truck has been sitting for several months. Heard that gasoline starts going bad after about 3-4 months. Fortunately, I didn’t have a whole lot of fuel in the tank, maybe 5-6 gallons, as the low fuel light was on. Siphoned all that I could, close to 6 gals. and replaced with 10 gals. of fresh fuel with Sea-Foam additive. No positive results!!!!!

Step 2: Parts replaced
Replaced spark plugs, wires, distributor cap, rotor and PCV, forgot how much fun this was! Noticed some corrosion on the contacts inside the distributor cap. Still no change….engine won’t get past 2000 rpms.

Step 3: Fuel pressure test results
With ignition switch on (engine not running), fuel pressure was 44 psi.
Engine running at idle (before warm-up) Needle was fluctuating rapidly between 44-54 psi.
Engine running at idle (after warm-up) Needle fluctuating between 46-48 psi.
Revving engine, needle fluctuating rapidly between 46-56 psi. I’m not understanding the rapid fluctuation of the needle, it would seem to me that it would be a gradual rise and fall of pressure.

Note: I’ve also noticed, what appears to be a hissing sound coming from the exhaust pipe, doesn’t seem to be a whole lot of pressure coming out either…….this won’t by chance mean a problem with my catalytic converter, does it? Can this cause the issue I’ve been having? Would pulling the upstream O2 sensor allow enough of the exhaust to escape to allow the engine to run properly?

I’m open to almost any suggestions, or just maybe one of you has had the same issue, as I really don’t want to have to take it to the dealer, I’d really prefer to keep my arms & legs, if you know what I mean?

Mike
Sounds like the Cat or exhaust is plugged up.
Same thing happened to my Son's vehicle.
We cut the pipe in front of the cat and it ran ok so we removed the cat and it was plugged. Some of the crap did go into the muffler too.

Keith

Last edited by Kman521; 01-06-2013 at 08:34 AM.
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  #3  
Old 01-06-2013, 08:34 AM
RamTech's Avatar
RamTech RamTech is offline
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Sounds a lot like a plugged up converter to me. I would recommed a back pressure test at this point. If you can't get hold of a back pressure gauge, you can connect a vacuum gauge to a manifold port, rev the engine up to 2000 rpm and see if if the vacuum reading starts moving toward positive pressure. Of course you can always remove the upstream sensor or converter itself and see if that alleviates the problem.
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  #4  
Old 01-06-2013, 03:00 PM
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brad12kx brad12kx is offline
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My vote is in for a plugged Cat as well. The symptoms are very typical of that.
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