after cracked manifold replaced, high (redline) rpm on startup
04-05-2007, 07:03 PM
#31
Guest
Posts: n/a
Re: after cracked manifold replaced, high (redline) rpm on startup
bet you did not get inatke manifiold seated on head correctly and now have
a vac. leak there
Scott wrote:
> Sounds as though you have a throttle connection binding or improperly
> connected. My guess is the throttle is stuck full tilt.
> Scott
>
> On 4 Apr 2007 18:16:38 -0700, juanjlopez@gmail.com wrote:
>
> >I replaced my cracked exhaust manifold on my 99 Jeep Wrangler 4.0L
> >(I-6). Note that this is really probably the 2nd time I try such a
> >large job (at least I usually just deal with oil changes). This
> >required the removal of the intake manifold also (because both intake
> >and exhaust share the same gasket). I made sure I removed everything
> >carefully. I disconnected 2 electrical connections and about 6 or so
> >hoses, and of course the fuel line.
> >
> >I re-tightent the bolts according to the sequence suggested (center
> >bolts first and then the outer). I tried to turn the jeep on, and the
> >engine just rev'ed really fast to redline. I immediately turned it off
> >(the first time probably let it run for 5 seconds). I double and
> >tripled checked the vacuum houses and all the connections I touched
> >during the replacement of the exahust manifold. Note that I did not
> >replace any hoses, except for a connector from the air intake that I
> >broke while trying to remove it. I still need to check to make sure I
> >torqued all the bolts to the correct amount. I tried turning it on
> >about 6-8 more times to see if It would eventually come to a normal
> >idle, but it never did. I actually did not let it run more than 1-2
> >seconds since every time I turned it on, it revs so fast, almost as if
> >I were pressing on the accelator. I did checked the throttle, and its
> >not stuck.
> >
> >My question is if a leak in the gasket or a vacuum hose will cause
> >this problem? Or what other things could I have screwed up while
> >replacing the exhuast manifold? Any suggestions I can try would be
> >very helpful.
> >
> >-Juan
a vac. leak there
Scott wrote:
> Sounds as though you have a throttle connection binding or improperly
> connected. My guess is the throttle is stuck full tilt.
> Scott
>
> On 4 Apr 2007 18:16:38 -0700, juanjlopez@gmail.com wrote:
>
> >I replaced my cracked exhaust manifold on my 99 Jeep Wrangler 4.0L
> >(I-6). Note that this is really probably the 2nd time I try such a
> >large job (at least I usually just deal with oil changes). This
> >required the removal of the intake manifold also (because both intake
> >and exhaust share the same gasket). I made sure I removed everything
> >carefully. I disconnected 2 electrical connections and about 6 or so
> >hoses, and of course the fuel line.
> >
> >I re-tightent the bolts according to the sequence suggested (center
> >bolts first and then the outer). I tried to turn the jeep on, and the
> >engine just rev'ed really fast to redline. I immediately turned it off
> >(the first time probably let it run for 5 seconds). I double and
> >tripled checked the vacuum houses and all the connections I touched
> >during the replacement of the exahust manifold. Note that I did not
> >replace any hoses, except for a connector from the air intake that I
> >broke while trying to remove it. I still need to check to make sure I
> >torqued all the bolts to the correct amount. I tried turning it on
> >about 6-8 more times to see if It would eventually come to a normal
> >idle, but it never did. I actually did not let it run more than 1-2
> >seconds since every time I turned it on, it revs so fast, almost as if
> >I were pressing on the accelator. I did checked the throttle, and its
> >not stuck.
> >
> >My question is if a leak in the gasket or a vacuum hose will cause
> >this problem? Or what other things could I have screwed up while
> >replacing the exhuast manifold? Any suggestions I can try would be
> >very helpful.
> >
> >-Juan
04-05-2007, 08:24 PM
#32
Guest
Posts: n/a
Re: after cracked manifold replaced, high (redline) rpm on startup
Thank for the follow up Juan.
Merrill
On Apr 5, 1:35 am, juanjlo...@gmail.com wrote:
> I should have taken L.W's advice about loosening and wiggling the
> intake. Instead I decided to start checking each screw by tightening
> each one to make sure it was at the correct setting. Well, it turns
> out that the intake was not seated properly. There are 2 holes on each
> side of the intake that are suppose to line up with engine. One of
> them was not lined up and as I tighted the screw (since it was not
> torqued to the correct amount) it broke of a small pieace of the
> intake. In any case that meant that whole side was loose. So I began
> to tighten each bolt again, and when over them several times. Turned
> on the Jeep, and it was back to its normal idle speed :). I can live
> with the small chip on the intake, as it appears to be running ok. I
> plan on driving it on short drives, and re-check the bolts in a couple
> of days. Thanks for everyones suggestions.
Merrill
On Apr 5, 1:35 am, juanjlo...@gmail.com wrote:
> I should have taken L.W's advice about loosening and wiggling the
> intake. Instead I decided to start checking each screw by tightening
> each one to make sure it was at the correct setting. Well, it turns
> out that the intake was not seated properly. There are 2 holes on each
> side of the intake that are suppose to line up with engine. One of
> them was not lined up and as I tighted the screw (since it was not
> torqued to the correct amount) it broke of a small pieace of the
> intake. In any case that meant that whole side was loose. So I began
> to tighten each bolt again, and when over them several times. Turned
> on the Jeep, and it was back to its normal idle speed :). I can live
> with the small chip on the intake, as it appears to be running ok. I
> plan on driving it on short drives, and re-check the bolts in a couple
> of days. Thanks for everyones suggestions.
04-05-2007, 08:24 PM
#33
Guest
Posts: n/a
Re: after cracked manifold replaced, high (redline) rpm on startup
Thank for the follow up Juan.
Merrill
On Apr 5, 1:35 am, juanjlo...@gmail.com wrote:
> I should have taken L.W's advice about loosening and wiggling the
> intake. Instead I decided to start checking each screw by tightening
> each one to make sure it was at the correct setting. Well, it turns
> out that the intake was not seated properly. There are 2 holes on each
> side of the intake that are suppose to line up with engine. One of
> them was not lined up and as I tighted the screw (since it was not
> torqued to the correct amount) it broke of a small pieace of the
> intake. In any case that meant that whole side was loose. So I began
> to tighten each bolt again, and when over them several times. Turned
> on the Jeep, and it was back to its normal idle speed :). I can live
> with the small chip on the intake, as it appears to be running ok. I
> plan on driving it on short drives, and re-check the bolts in a couple
> of days. Thanks for everyones suggestions.
Merrill
On Apr 5, 1:35 am, juanjlo...@gmail.com wrote:
> I should have taken L.W's advice about loosening and wiggling the
> intake. Instead I decided to start checking each screw by tightening
> each one to make sure it was at the correct setting. Well, it turns
> out that the intake was not seated properly. There are 2 holes on each
> side of the intake that are suppose to line up with engine. One of
> them was not lined up and as I tighted the screw (since it was not
> torqued to the correct amount) it broke of a small pieace of the
> intake. In any case that meant that whole side was loose. So I began
> to tighten each bolt again, and when over them several times. Turned
> on the Jeep, and it was back to its normal idle speed :). I can live
> with the small chip on the intake, as it appears to be running ok. I
> plan on driving it on short drives, and re-check the bolts in a couple
> of days. Thanks for everyones suggestions.
04-05-2007, 08:24 PM
#34
Guest
Posts: n/a
Re: after cracked manifold replaced, high (redline) rpm on startup
Thank for the follow up Juan.
Merrill
On Apr 5, 1:35 am, juanjlo...@gmail.com wrote:
> I should have taken L.W's advice about loosening and wiggling the
> intake. Instead I decided to start checking each screw by tightening
> each one to make sure it was at the correct setting. Well, it turns
> out that the intake was not seated properly. There are 2 holes on each
> side of the intake that are suppose to line up with engine. One of
> them was not lined up and as I tighted the screw (since it was not
> torqued to the correct amount) it broke of a small pieace of the
> intake. In any case that meant that whole side was loose. So I began
> to tighten each bolt again, and when over them several times. Turned
> on the Jeep, and it was back to its normal idle speed :). I can live
> with the small chip on the intake, as it appears to be running ok. I
> plan on driving it on short drives, and re-check the bolts in a couple
> of days. Thanks for everyones suggestions.
Merrill
On Apr 5, 1:35 am, juanjlo...@gmail.com wrote:
> I should have taken L.W's advice about loosening and wiggling the
> intake. Instead I decided to start checking each screw by tightening
> each one to make sure it was at the correct setting. Well, it turns
> out that the intake was not seated properly. There are 2 holes on each
> side of the intake that are suppose to line up with engine. One of
> them was not lined up and as I tighted the screw (since it was not
> torqued to the correct amount) it broke of a small pieace of the
> intake. In any case that meant that whole side was loose. So I began
> to tighten each bolt again, and when over them several times. Turned
> on the Jeep, and it was back to its normal idle speed :). I can live
> with the small chip on the intake, as it appears to be running ok. I
> plan on driving it on short drives, and re-check the bolts in a couple
> of days. Thanks for everyones suggestions.
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