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Old 07-09-2013, 05:04 PM
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Default Engine dies at idle/Trans?Vib,1st gr. 5spd stk

I have a 1991 jeep wrangler renegade, 4.0L, fuel injected, 5 sp manual (AX-15?), 175,000 miles.
I started to have a vibration when starting out in first gear.. I thought it was the locking diff. Then I thought it was my clutch. I took it to a specialist he put in a new clutch, pressure plate, T-bearing, slave cyl. & trans. front seal. I still have the same problem. After talking to another jeep owner he said first gear in the trans. does that and it will get worse, but you can have heavy duty parts installed in your trans. and that will take care of my problem. Can you add or confirm this, or tell me what you think? I also have a idling problem (once in awhile). If the red light comes on, on the dash I know when I get off the gas the engine will die. If the red light stays off it runs like new. The more I dive it the less chance the red light comes on.
Please help.
Thanks Doug
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Old 07-10-2013, 07:13 AM
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The vibration could be caused by bad motor mounts. Also some Jeeps have an arm that projects off the right side of the transmission mount to a rubber snubber designed to limit side to side rocking. If that's shot or missing it could allow the apparent clutch chatter.

Or it could be an engine problem - one cylinder being significantly weaker than the rest, which shows up most significantly at low engine speeds and heavy loads, as when starting from rest. That could also be related to the idle problem you're having. A compression test is the first step to looking for that. At 175K miles that's a good idea regardless.

Let us know what you find.
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Old 07-11-2013, 12:55 AM
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Default Engine dies at idle/Trans?Vib,1st gr. 5spd stk

The motor & trans. mounts are new and the right side of the transmission mount to a rubber snubber designed to limit side to side rocking, is also all brand new. The clutch system is all new for the second time, from the pilot brg. to the front trans. seal by (Clutch Pro.) Still the vibration is only when starting off in first gear. If I short shirt to 2nd early I can floor it, burn rubber, no vibration. I just did a major tune on the eng. Plugs looked great, burning even. Engine runs like new. Just had it smogged. Every yr. it tests at the very lowest values. The smog tech always comments how clean & excellent this jeep runs. In the cab and standing next to the jeep you canít tell itís running. Once in awhile, the engine check light comes on then I know to watch for the engine dying when the engine comes to idle. Please help. Thanks for the reply. Doug
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Old 07-11-2013, 04:39 PM
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Welcome Doug,

A couple of diagnostic tasks:

1. Put the Jeep in 4wd high. Does it vibrate in 1st? How about 4wd low? This may give you some additional info.
2. Ask the computer about the stalls:
Turn the key from run to off 5 times in a row, leaving it at run. The Check Engine light should flash codes. They are tricky at first to get, but you will. You can do the 5x key trick as many times as you want.

List of codes/standard meanings:
11: No ignition reference signal detected during cranking (bad hall effect) OR timing belt skipped one or more teeth; or intermittent loss of either camshaft or crankshaft position sensor
12: Memory Standby power lost (Battery or computer recently disconnected)
13: No change in Manifold Absolute Pressure sensor (MAP) from start to run
14: MAP sensor circuit open or shorted; voltage too low
15: No speed/distance sensor signal
16: Loss of battery voltage detected with engine running
17: Engine stays cold too long (bad thermostat)
21: Oxygen sensor signal out of range, possibly shorted
22: Coolant sensor signal out of range (or disconnected to set timing)
23: Intake air temperature signal out of range
24: Throttle position circuit out of range
25: Automatic Idle Speed (AIS) motor driver circuit shorted or target idle not reached, vacuum leak found
26: Peak injector circuit voltage has not been reached
27: Logic module fuel circuit internal problem or TBI injector does not respond properly to control signal
31: Evaporator Purge solenoid circuit open or shorted or Evaporator solenoid circuit
32: EGR system failure or Power loss lamp open or shorted
33: Air conditioning clutch relay circuit open or shorted ( Also will show up for rigs without AC)
34: Speed control vacuum or vent solenoid circuits open or shorted
35: Cooling fan relay circuit open or shorted
36: Wastegate control circuit open or shorted
37: Shift indicator light failure, 5-speed (blown bulb) OR Park/neutral switch failure OR Torque converter unlock circuit open or shorted, A-413 4-speed auto
41: Alternator field control circuit open or shorted
42: Automatic shutdown relay circuit open or shorted
42: Fuel pump relay control circuit
42: Fuel level unit - no change over miles OR Z1 voltage missing when auto shut-down circuit energized
43: Peak primary coil current not achieved with max dwell time OR Cylinder misfire
43: Problem in power module to logic module interface
44: No FJ2 voltage present at logic board OR Logic module self-diagnostics indicate problem OR Battery temperature out of range
45: Turbo boost limit exceeded (engine was shut down by logic module)
46: Battery voltage too high during charging or charging system voltage too low
47: Battery voltage too low and alternator output too low
51: Oxygen sensor stuck at lean position OR Internal logic module fault ('84 turbo only)
52: Oxygen sensor stuck at rich position OR Internal logic module fault ('84 turbo only)
53: Logic module internal problem
54: No sync pickup signal during engine rotation (turbo only) OR Internal logic module fault ('84 turbo only)
55: End of codes
61: "Baro" sensor open or shorted
62: EMR mileage cannot be stored in EEPROM
62: PCM failure SRI mile not stored
63: Controller cannot write to EEPROM
64: Catalytic converter efficiency failure
65: Power steering switch failure
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Old 07-11-2013, 10:06 PM
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How much lift?
What tire size?
What axle gear ratio?
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Old 07-12-2013, 06:50 AM
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Default Engine dies at idle/Trans?Vib,1st gr. 5spd stk-Thanks Scott

Scott,
First, thanks for the welcome. Thanks for the diag. tasks, I'll do this ASAP. Will these codes show up if the Jeep does (NOT) have the (light on, then dies?) It only happens once in awhile, it could go weeks without doing this.
Thanks again, Scott,
Doug
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Old 07-12-2013, 11:27 AM
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The computer should be keeping the codes if you have not disconnected the battery. If it is empty, it usually flashes 12 (battery Disconnect in last 50 starts) then 55 (End of Codes).

Of course there is a youtube on the procedure, what isnt:
TheDailyJeep: How to Retrieve and Diagnose Your Jeep's Check Engine Light Codes - YouTube
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Old 07-13-2013, 03:05 AM
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Default Engine dies at idle/Trans?Vib,1st gr. 5spd stk-Thanks Scott(AGAIN)

Thanks again, Scott. I was going to wait for the light to come on and the eng. to die at idle before testing. Now sence the codes will store in the computer, I'll try the test Sat. (Tomorrow) and let you know. Again, thanks so much for the help!!
Doug
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Old 07-15-2013, 01:46 PM
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Default Engine dies at idle/Trans?Vib,1st gr. 5spd stk (3)

Scott, Iím confused. I tried the computer number test, but I canít figure out how to read the code? It seems thereís a delay in the readings. How do you count? I get about 3 flashes then a hesitation then maybe 5 flashes and so on. And do I count till the flashes stop? Please tell me the secrete.
Thanks again,
Doug
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Old 07-15-2013, 04:12 PM
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The light will blink on for either a long time or a short time. Long is maybe a second while short may be half a second. The long flashes are the first (tens) digit. The shorts are the second digit. So three longs followed by five shorts would be thirty five. Then there's a pause and it goes to the next error code. When it has run through all of its errors it starts over.
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