99 am misfire rough idle - JeepForum.com
 
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post #1 of 12 Old 08-02-2021, 08:36 PM Thread Starter
Thurmand92
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99 am misfire rough idle

Ok, I have a 99 wj with the 4.0 trying to figure out my rough idle issue. I have a code for the trans govonor pressure sensor but no other codes. Had an issue with stumbling and cutting off but resolved that by replacing cam and crank sensors. Have also replaced o2 sensor, TPS, and sparkplugs. Can the trans pressure sensor cause a misfire like symptom?

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post #2 of 12 Old 08-03-2021, 07:51 AM
jtec
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I am guessing your CEL is on, have system scanned (free at many part stores) pst ALL codes the scanner retrives.

Have you cleaned the IAC?
Have you checked fuel pressure, with a gauge?
Looked at spark plugs? Black, wet, dry, tan ? What plug # champion xyz?
Is engine reaching temp @220degF ?

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #3 of 12 Old 08-03-2021, 07:55 AM
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[QUOTE=jtec;41326767]I am guessing your CEL is on, have system scanned (free at many part stores) pst ALL codes the scanner retrives.

Have you cleaned the IAC?
Have you checked fuel pressure, with a gauge?
Looked at spark plugs? Black,wet,dry,tan ?
What plug IIRC champion - RC12ECC?
Is engine reaching temp @220degF ?

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #4 of 12 Old 08-04-2021, 04:51 AM Thread Starter
Thurmand92
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[quote=jtec;41326769]
Quote:
Originally Posted by jtec View Post
I am guessing your CEL is on, have system scanned (free at many part stores) pst ALL codes the scanner retrives.



Have you cleaned the IAC?

Have you checked fuel pressure, with a gauge?

Looked at spark plugs? Black,wet,dry,tan ?

What plug IIRC champion - RC12ECC?

Is engine reaching temp @220degF ?
P1762
P1763

Have cleaned IAC
Replaced TPS

Plugs are NGK 3459
Haven't checked current condition replaced beginning of july

Unknown fuel pressure

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post #5 of 12 Old 08-04-2021, 07:06 AM
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do you have a scanner - view live data?

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #6 of 12 Old 08-04-2021, 12:52 PM Thread Starter
Thurmand92
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Quote:
Originally Posted by jtec View Post
do you have a scanner - view live data?
Do not have a live scanner

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post #7 of 12 Old 08-05-2021, 01:13 PM Thread Starter
Thurmand92
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Got some live data at idle discovered a misfire on cylinder2

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post #8 of 12 Old 08-05-2021, 02:15 PM
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I can't read that -
Can you post
ECT engine temp
MAP reading vacuum
TPS throttle reading
fuel trims long and short don't forget the + or -
o2 sensoe swings - precat sensors ie .02 to .07, or stuck at .0x
Also if the snappy displayed any codes.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #9 of 12 Old 08-05-2021, 06:39 PM Thread Starter
Thurmand92
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ECT engine temp. 190

MAP reading vacuum-- 18.6

TPS throttle reading-- 0.78v
Throttle 0%

fuel trims long and short

short 0.0
Long-7.3 when doing purge vapors test

But short 0.0
Long 0.0 when in live view

o2 sensoe swings - not sure

Only codes were the previous trans codes I mentioned before

P1762
P1763
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post #10 of 12 Old 08-06-2021, 03:00 PM Thread Starter
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Spark plugs all look about the same

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post #11 of 12 Old 08-06-2021, 03:11 PM Thread Starter
Thurmand92
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Also got a p0302 and a p0132 code today

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post #12 of 12 Old 08-19-2021, 09:34 AM Thread Starter
Thurmand92
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Fixed problem Sith new coil rail and pigtail adapter to adapt the 99 wiring to a 2000-04 coil rail

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