Engine running bad at normal temp!

Ernie R · 03-28-2009, 11:22 PM

Hello im back with the same problem i have a 2000 chevy c2500 with a 5.7 350 for the past year i have had problems with my truck running bad wile at normal temp here is a list of things i have replaced, ignition coil, tps sensor, engine heat sensor, distributor, knock sensor, fuel pump 2 times with new wire harness, new fuel injector spider the updated version, all new o2 sensors, and i still have this problem when my engine is at normal temp it seems to shut off fuel it idles bad and backfires inside the manifold when i step on the gas and when i shut off the engine it will not start again till it cools down im runnig out of options and money verry frustrating for me i also had my cats inpected and they are good! can anyone help please thank you!!

leolkfrm · 03-29-2009, 12:09 AM

Have you put it on a good scanner while driving to see what parts are breaking down when hot?

Ernie R · 03-29-2009, 12:46 AM

yes i did and the only thing that came up was a 02 sensor heater malfunction so i replaced all of my o2 sensors and the problem remained!

hotrodpc · 03-29-2009, 04:30 AM

Wow, I hate to make a suggestion and have you spend more money then that not be the problem. I can sure see and empathize your frustration. This could be way off, I used to drive Ford Cutaway shuttles at the airport. When had a similar problem, but not exact as yours since it seemed to run OK, not good, but OK, then we'd shut it off for a 30 minute lunch break, and it wouldn't start. Wait another 45 minutes or so to cool and it would start like nothing was ever wrong at all. It became a common issue and when this would happen, they knew to replace the crankshaft sensor and problem was solved. Also to note, they never did throw a code when they went bad. We'd drive them for a week for this way until the part came in, it was just that we knew not to shut it off for our whole shift or it would not start for over an hour. In that whole week of driving it, never threw the code. You may want to find a way to test your crankshaft sensor. Test it cold, then drive the truck, get it normal temp, and test it again.

Case 7230 · 03-29-2009, 05:53 AM

Have you had the fuel pressure checked?

leolkfrm · 03-29-2009, 06:20 AM

not a code reader but a scanner so you can look at the values of the sensors

Ernie R · 03-29-2009, 12:47 PM

Thanks to all who have responded i did run my truck with a scanner from a chevy dealer my buddy works at while driving my truck and the only thing that came up was a o2 sensor heater malfunction and i also checked my fuel presure it was good 50 to 65 psi.

batty1214 · 03-29-2009, 02:02 PM

as hotrod suggested, you might check your crank postion sensor....... thats what was wrong with my wifes truck, and it showed a code for the O2 sensors, but replaced them, and did nothing. changed the crank sensor, and it runs like a dream

Ernie R · 03-30-2009, 02:08 PM

Thank's to all who replied i will see if i can get a hold of a crank sensor and run my truck till it get's up to normal temp and goes bad and then i will change the sensor right away and try to start it up that should gime me my answer!!!

03-28-2009, 11:22 PM	#1
Ernie R Full Member Join Date: Dec 2008 Posts: 12	Engine running bad at normal temp! Hello im back with the same problem i have a 2000 chevy c2500 with a 5.7 350 for the past year i have had problems with my truck running bad wile at normal temp here is a list of things i have replaced, ignition coil, tps sensor, engine heat sensor, distributor, knock sensor, fuel pump 2 times with new wire harness, new fuel injector spider the updated version, all new o2 sensors, and i still have this problem when my engine is at normal temp it seems to shut off fuel it idles bad and backfires inside the manifold when i step on the gas and when i shut off the engine it will not start again till it cools down im runnig out of options and money verry frustrating for me i also had my cats inpected and they are good! can anyone help please thank you!!

03-29-2009, 12:09 AM	#2
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,887	Have you put it on a good scanner while driving to see what parts are breaking down when hot? __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

03-29-2009, 06:20 AM	#6
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,887	not a code reader but a scanner so you can look at the values of the sensors __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

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03-29-2009, 12:46 AM	#3
Ernie R Full Member Join Date: Dec 2008 Posts: 12	yes i did and the only thing that came up was a 02 sensor heater malfunction so i replaced all of my o2 sensors and the problem remained!

03-29-2009, 04:30 AM	#4
hotrodpc Senior Member Join Date: Jul 2008 Location: OK Posts: 6,928	Wow, I hate to make a suggestion and have you spend more money then that not be the problem. I can sure see and empathize your frustration. This could be way off, I used to drive Ford Cutaway shuttles at the airport. When had a similar problem, but not exact as yours since it seemed to run OK, not good, but OK, then we'd shut it off for a 30 minute lunch break, and it wouldn't start. Wait another 45 minutes or so to cool and it would start like nothing was ever wrong at all. It became a common issue and when this would happen, they knew to replace the crankshaft sensor and problem was solved. Also to note, they never did throw a code when they went bad. We'd drive them for a week for this way until the part came in, it was just that we knew not to shut it off for our whole shift or it would not start for over an hour. In that whole week of driving it, never threw the code. You may want to find a way to test your crankshaft sensor. Test it cold, then drive the truck, get it normal temp, and test it again.

03-29-2009, 05:53 AM	#5
Case 7230 Senior Member Join Date: Dec 2007 Posts: 663	Have you had the fuel pressure checked?

03-29-2009, 12:47 PM	#7
Ernie R Full Member Join Date: Dec 2008 Posts: 12	Thanks to all who have responded i did run my truck with a scanner from a chevy dealer my buddy works at while driving my truck and the only thing that came up was a o2 sensor heater malfunction and i also checked my fuel presure it was good 50 to 65 psi.

03-29-2009, 02:02 PM	#8
batty1214 Senior Member Join Date: Nov 2008 Location: Vernal Utah Posts: 1,276	as hotrod suggested, you might check your crank postion sensor....... thats what was wrong with my wifes truck, and it showed a code for the O2 sensors, but replaced them, and did nothing. changed the crank sensor, and it runs like a dream

03-30-2009, 02:08 PM	#9
Ernie R Full Member Join Date: Dec 2008 Posts: 12	Thank's to all who replied i will see if i can get a hold of a crank sensor and run my truck till it get's up to normal temp and goes bad and then i will change the sensor right away and try to start it up that should gime me my answer!!!