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-   -   Burning gas, bucking & serging (https://www.jeepforum.com/forum/f310/burning-gas-bucking-serging-4355977/)

KellyannD 05-15-2019 03:47 PM

Burning gas, bucking & serging
 
2000 Grand Cherokee Laredo
Started out with a backfire & black soot on the ground & tail pipe. From that moment, I burned through a tank of gas every 2 days. It wasn't doing anything else except for a very rare hiccup (buck) while driving.
Replaced the coil pack, spark plugs & pcv valve & hose. The valve only because it basically crumbled apart and had to be placed.
Since that ^^^^^ it is not burning through gas anymore but now it shakes & rattles, vibrates, idles poorly and has no get up & go power. Once I do get to 60-70 mph, if the cruise is on it has big power surges. Engines kicks in & rpms race up to 4+. Takes a good 20 sec for it to kick in to gear and level out again unless I turn the cruise off.
Am I looking at fuel injectors now or, before I spend that amount of money, could it possibly be something else??

leadsled jeep 05-15-2019 06:48 PM

127 Attachment(s)
With running conditions like those there should be some error codes I’d think. O2 codes maybe large vacuum leak.

Mattyjm 05-15-2019 08:54 PM

I'd think PCM or Throttle Position Sensor along with Idle Air Control Valve.

grayWJ4x4 05-16-2019 01:14 PM

Clean or replace the idle air sensor and check for codes for the crank position sensor.


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