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Old 12-15-2008, 08:51 PM
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Engine Breaking Up

Hi all, I'm finally giving up, swallowing my pride and asking.... I have @1993 chevy k1500 4 wheel drive pick up with 5.7 (350), 4l60e tranny with 220,000 miles on it. Truck idles fine, hand actuating the throttle body rev's just fine. put it in gear and drive away just fine... acts normal in first gear, after it shifts into second sometimes at the end of first gear be for shift, when engine starts to climb in rpm range the engine begins to break up. I did the basics.. new cap, rotor, plugs, spark plug wires etc....any ideas as to what I'm looking at? transmission issues? fuel issues?

Thanks..

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Old 12-16-2008, 07:09 AM
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Quote:
with 220,000 miles on it.
Ayuh,...

How long has it been since you changed the Fuel Filters,..??

Going Lean at higher rpms will do that,+ leads Me to believe it's a Fuel Delivery Issue...
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Old 12-16-2008, 07:27 AM
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I had a similar problem with my 97 Burb. I had a small head-gasket leak - losing coolant slowly - that got worse. The head-gasket finally started leaking between 2 cylinders. As the engine lost more compression the problem became worse. In neutral you could rev the engine freely put it in gear take off normal but not get the engine to pull past 3000 rpm. So you might try a compression check.
Jeff
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Old 12-16-2008, 10:40 AM
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Thanks for replying.... It has been quite a while since I changed the fuel filter. The last time I ended up changing all the fuel lines (supply and return) as well as the sending unit and the fuel pump in the tank. They were all rusted together so one thing lead to the next.... I did check my fluids when I did the basics and my radiator was low.... what would the spark plugs look like? I only got a chance to pull three so far and look at them they were all a light brown almost white.... Is that normal? I got to try and pull the other five tonight... Maybe it is the head gasket? I did just change the fuel tank out this summer, I didn't do what I should have and change the filter and the fuel pump because I could not get the lines apart so I wrestled the tank in without disturbing the sending unit...(i know stupid, in a hurry)

Thanks
Bill
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Old 12-16-2008, 10:57 AM
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Do what Bondo said.
White spark plugs do indicate that you have a fuel delivery issue.
They should look deer brown if your fuel is mixed and burned correctly.
Tomi
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Old 12-16-2008, 11:02 AM
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I'll check all of the plugs tonight, it could be a fuel delivery problem do to my laziness this summer. If I have a bad head gasket do the plugs show anything as an indicator? I will probably go an buy a compression tester anyway (at 220,000 I should probably test it anyway) and see what my compression is on all the cylinders but I am just curious is the plugs would also have some tail tell signs as well...

Thanks,
Bill
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Old 12-16-2008, 05:53 PM
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A few months before this issue I had replaced the fuel pump and did a complete tune up. Not knowing there were issues with the fuel pump harness connector I replaced several other components like map sensor, ignition module, fuel pressure regulator before dropping the tank a second time. When this issue started I dropped the truck off at a shop where they had it for 3 weeks thinking fuel and turned out to be a head-gasket. All I'm sayin is cover the basics first. Fuel pressure and cylinder compression are 2 good ones.
Jeff
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Old 12-16-2008, 07:35 PM
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A leakdown tester will tell you way more than a crank compression test.
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Old 12-17-2008, 06:17 AM
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Quote:
If I have a bad head gasket do the plugs show anything as an indicator?
Ayuh,....

Only if it's injesting Antifreeze/ Water....

If So,... The sparkplugs will be Brand New Clean, No Deposits....

Or,....
If the compression is So Low, it's not firing,... The plugs will be Covered with $h!t.....
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