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bobs5310
Novice
May 31, 2009, 6:34 AM
Post #1 of 10
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93 Jeep Grand Cherokee with 4.0 engine and automatic trans. When weather is cool car runs fine but the warmer the weather gets the more the engine misses. Doesn't matter if climbing hill or flat road. I have replaced the two temperature sensors on the engine and it didn't make any difference. Thanks Bob
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Hammer Time
Ultimate Carjunky
/ Moderator
May 31, 2009, 1:44 PM
Post #2 of 10
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Re: Egine missing
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What about the ignition system? What have you done there?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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bobs5310
Novice
May 31, 2009, 7:17 PM
Post #3 of 10
(1425 views)
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Re: Egine missing
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New plugs, rotor, distributor cap and plug wires. Also new cam sensor.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 1, 2009, 1:06 AM
Post #4 of 10
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Re: Egine missing
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Are you able to isolate which cylinders are misfiring? Is this a constant, dead miss?
What do those plugs look like when removed?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 1, 2009, 6:56 AM
Post #6 of 10
(1409 views)
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Re: Egine missing
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It's pretty difficult to make any kind of diagnosis in a situation like that in this format. It's one of those things where a picture is worth a thousand words and your description doesn't tell us a lot.
Somehow we need to isolate whether it's fuel or ignition triggering this.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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bobs5310
Novice
Jun 1, 2009, 8:39 AM
Post #7 of 10
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Re: Egine missing
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Can you tell me how to check for lack of fuel
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 1, 2009, 10:04 AM
Post #8 of 10
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Re: Egine missing
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You'll have to hook up a fuel pressure gauge and rig it so you can see it while driving.
There should be a service test port on the fuel rail.
The spec is
Key On, engine running 214 kPa (31 psi)
Regualtor vacuum hose disconnected 269-283 kPa (39-41 psi)
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Asilus
User
Jun 9, 2009, 8:27 PM
Post #9 of 10
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Re: Egine missing
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When i replace sensors I personally reset the ECM, may have old info saved from bad senser... When air is cool, its denser wich allows more to flow in using the same volume... when the ambient air is warm, it expands wich in turn means less air flowing into your engine at the usual rate... so with that being said ima throw out there a MAP ( Manifold Absolute Pressure ) valve possibly.
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bobs5310
Novice
Jun 12, 2009, 6:41 AM
Post #10 of 10
(1344 views)
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Re: Egine missing
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Thanks for you're help, I'll try that.
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