Question about 1993 Jeep Grand Cherokee

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Running rich. No power. 5.2 v8

I checked the TPS and MAFS, replaced the O2 sensor. No codes.
Starts and idles fine. I have an exhaust leak in the tube that runs to the EGR valve at the Exhaust manifold . could that leak cause the engine to run bad? What else could it be?

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  • am210 Dec 03, 2008

    Turns out that the cat failed. I drilled some holes in it and the jeep runs fine.

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93 Jeep grand cheorkee 5.2 L engine, no power is getting yo fuel pump

Posted on Feb 15, 2010

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It can cause it to run rich because the oxygen sensor may be getting a false reading as to how much oxygen is there....this in turn causes the pcm to add more fuel

Posted on Dec 02, 2008

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2.3l 2001 ford ranger rough idle and running rich and misfiring with p0301 code


You have to correct the cylinder misfires first

You may have vacuum leaks somewhere in the
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You really need to look at data with a scan tool

You start with Mode $06 & cylinder misfire count ,if that
even works well on your motor

Then you look at fuel trim & add short & long together,
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All the data is only good if you haven't cleared it or disconnected
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You made no mention of checking for codes
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Okay, lets start with you checking the fuel preasure regulator, this is a common problem with these the regulator leaks and the vac line connected to it starts sucking gas into the intake, this causing it to run rich and depending on how bad the leak is it will stall engine at idle, remove the vacuum hose from regulator and start engine then see if gas shoots out the vac connection on the regulator, if it does then replace regulator, hope this helps.583ec1c.jpg

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I have a holden 5litre v8 and am having problems with the fuel injection. the engine runs erratically at idle and blows black smoke when put under load. i have replaced, injectors, filter, regulator,...


Have the oxygen sensors checked or replaced.

This in an extract from an article on O2 sensors from an article at www.autotap.com:-
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A lot of factors affect the richness or leanness of the fuel mixture, including air temperature, engine coolant temperature, barometric pressure, throttle position, air flow and engine load. Other sensors monitor these factors too, but the O2 sensor is the master monitor for what's happening with the fuel mixture. Problems with the O2 sensor can throw the whole system out of whack.'

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I had same problems w/ my 99 Chateau 5.4L. EGR-Ensure port into intake and pipe from exhaust are clear using low pressure compressed air. Pull vacuum on EGR diaphram and ensure it opens and closes smoothly. If this checks out then problem is probably in the EGR sensor (mine had both ports and hoses clogged w/ aluminum corrosion from the sensor, cleaned out hoses and lines to exhaust pipe w/ compressed air, ended up having to change the sensor). IDLE AND O2 SENSOR- Caused by vacuum leaks in the PCV line (line is plastic wrapped w/foam insulation; was cracked under the insulation; both rubber end connectors at manifold and pcv valve were softened, collapsed and leaking; allowing excess air into the manifold after the mass air flow sensor which throws off the O2 sensors. engine computer does not read O2 sensors until after engine is warmed up which is why idle is fine until then).

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O2 sensor problem, running rich. Please help


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check fuel pressure and check exhaust for leaks. exhaust leaks caqn play with the o2 sensor readings

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