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#1
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I'm going to take full advantage of the general talk area. I want to give you guys a problem I ran into this week and see if you can figure it out. Call it a game, whatever. This happened on a car, but we'll pretend it's a Cub, just so it's less intimidating. Just because, let's say it's a Cyclops 2182 (3cyl Kubota, because then the engine is similar to a car). Hope at least someone plays.
Rules: You can ask any question, and I'll tell you the answer that I found. History: ~None. Brand new to the owner. Bought off individual, no questions asked. Discovered the problem after bringing it home. I figured out it had been on fire at one point, so electrical problems are a possibility. Also appeared that the engine had been apart somewhat recently. (Newer looking gasket on the timing cover, only one I could see easily.) Problem: ~Won't idle. Seems to get worse the warmer the engine. ~Runs decent above idle, but lacks power/ weak acceleration. (Customer didn't realize it, but it did.) ~Misfire (Most noticeable at idle.) Initial findings: ~Running rich ~Low vacuum at idle ~Confirmed ignition misfire. What problem do you address first? What's the first step? |
#2
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No more cubs. But never fear there will be more ![]() ![]() ![]() ![]() |
#3
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1998 Pontiac Sunfire
2.4L 4cylinder DOHC Chain driven timing, chain driven water pump. Codes revealed engine misfire, idle control problem Data stream showed negative fuel trim on short and long term, low MAP reading, but low 02 with very slow to respond on post cat o2 sensor Mentioned the gasket only because I noticed it, but head was dirty, so was the cover. I thought it may have been changed because of an oil leak. Also, it was near the apparent fire damage. But no evidence suggesting it was recently worked on. Most OEM GM gaskets are black, this one was blue. |
#4
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I had one like what you are describing a while back the intake gasket was leaking. You can use a benzo propane torch to test it by spraying under the intake runners. Just chased my tail a couple of months ago on the same problem.
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#5
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Very good! Your thinking vacuum leak, as did I. So, I used a mechanical gauge to confirm the MAP reading. 10" mercury at idle. Both the mechanical gauge and MAP matched. Now, I figured I should be able to hear a 10" vac leak. Thats huge! But I head nothing. Plus IAC position showed it open quite a bit. Visual inspection confirmed. It did not have any vacuum leaks.
Keep em coming! Under edit: tech1979, I see that's your first post, but your not a new member. Thanks for posting and playing along! Keep the ideas coming! |
#6
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The J-mech puzzler, do I just post my answer here or do I send it in on a $20 bill?
Quote:
Quote:
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#7
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Bill, I prefer you send in your response with non-presidential bills.
![]() ![]() Your exhaust idea is good! Convince me why I need to check the exhaust for full credit. ![]() Can't believe no one went after the easy problem first...... I always do easy first. ![]() |
#8
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If your not a car guy, here's what we just determined:
Engine is still missing, and still running rich (the computer is trying to lean it out). The choke (IAC) is open and doing it's job. No vacuum leaks (which technically would cause a lean condition) but is is low on vacuum. Still won't idle, just stumbles until it dies. At this point there is no evidence to support the carb (fuel injectors) are over-fueling. |
#9
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Random ignition misfires? Any codes? Compression readings?
Clogged cat from misfires or possibly cam timing is what I am going with until I know the answers to my questions. Oh how bad was the fire? Could the cat have gotten hot enough to start the fire?
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Travis 1993 Cub Cadet 2064 1988 Cub Cadet 2072 1980 IH Cub Cadet 782 w/CH20 1966 IH Cub Cadet 102 w/K301 1961 IH Cub Cadet O 1967 IH Cub Cadet 102 & 122 ![]() ![]() ![]() ![]() JD 2155 w/ 175 loader |
#10
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Random misfire: yes
Codes: nothing pertinent or helpful, so ill just say no Fire was centered at the fuel rail. Most noticeable damage at injector harness. No, cat was not the source of the fire. Compression..... good question! I checked compression. Cranking, all plugs out, throttle plate full open: 225 psi on all 4. (Too high, agreed?) After that, I decided plugged exhaust. Dropped pipe at manifold (before the cat). No change. All symptoms still present. |
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Cub Cadet is a premium line of outdoor power equipment, established in 1961 as part of International Harvester. During the 1960s, IH initiated an entirely new line of lawn and garden equipment aimed at the owners rural homes with large yards and private gardens. There were a wide variety of Cub Cadet branded and after-market attachments available; including mowers, blades, snow blowers, front loaders, plows, carts, etc. Cub Cadet advertising at that time harped on their thorough testing by "boys - acknowledged by many as the world's worst destructive force!". Cub Cadets became known for their dependability and rugged construction.
MTD Products, Inc. of Cleveland, Ohio purchased the Cub Cadet brand from International Harvester in 1981. Cub Cadet was held as a wholly owned subsidiary for many years following this acquisition, which allowed them to operate independently. Recently, MTD has taken a more aggressive role and integrated Cub Cadet into its other lines of power equipment.
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