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Old 08-21-2010, 04:25 AM   #1
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I really want to love it but its giving me grief....

Hi All,

As per my intro I have just purchased a 97 TJ which has a few issues.

I have changed all the brakes as they were in a proper mess and now I move onto niggly problem that I cannot get to the bottom of

I started with full tune up as a starting point

oil, plugs, leads, air filter, rotor arm & yesterday a new manifold

Its an odd one, when I start up all seems well, once up to temperature It has a slight hesitation/miss when at idle, it also seems to not have as much power, I also have slightly more engine noise noticeable from the passenger foot well area (US drivers side as I am RHD) almost like a sewing machine, not overly intrusive but I do not notice it at all when its cold

I have cleaned the throttle body & Idle valve, even disconnected the front O2 sensor which did not throw a check engine light or make any noticable difference....

now I am stuck, can anyone help??

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Old 08-21-2010, 04:30 AM   #2
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Did you do the manifold replacement yourself?

With the extra noise on your passenger side (us drivers side) and the manifold being replaced I would first look to see if the three vacuum line were connected to the intake manifold. Then ....MAKE SURE the exhaust manifold is correctly seated on the block. There is two alignment pins that it must be set square on to seat all the way. Otherwise you get and exhaust leak.

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Old 08-21-2010, 06:11 AM   #3
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Quote:
Originally Posted by distortedtj View Post
Did you do the manifold replacement yourself?

With the extra noise on your passenger side (us drivers side) and the manifold being replaced I would first look to see if the three vacuum line were connected to the intake manifold. Then ....MAKE SURE the exhaust manifold is correctly seated on the block. There is two alignment pins that it must be set square on to seat all the way. Otherwise you get and exhaust leak.
Thanks for the prompt reply,

I had a garage replace the manifold so I really do not know, (its not intrusive, I may just be being paranoid!, its a quieter version of the manifold I replaced unnecessarily as there was nothing wrong with it... grrrr (100 muppet points to me) ) I disconnected the battery yesterday and took it for a drive this morning it is throwing a code 21 when I do the key on/off 3 times thing.

Is it worth changing the o2 sensor to rule it out? I would assume a leaking manifold would throw the same code too
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Old 08-21-2010, 07:05 AM   #4
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Edited after re-read.

Start it, parking brake, and crawl around and find the source of the noise. If it is an exhaust leak, find it and fix it first.

Might be worth changing the O2 sensor, as that is the generic code range.
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Old 08-24-2010, 10:44 AM   #5
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for what its worth I have ordered front & rear NTK sensors so I can rule them out,

would have cost £235 (about $362) to buy from my stealer, so I have ordered from summit racing for $174 delivered to the uk!!!
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Old 08-25-2010, 08:59 AM   #6
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Sounds like the manifold might not be seated properly. I'd have the shop that did the work to recheck the work they did.
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Old 09-10-2010, 10:31 AM   #7
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Ok, new sensors all installed & the o2 sensor code has now gone...but the dodgy miss/idle still present, it seems to be fine when cold but as soon as its warm it just sounds unhappy, nothing major just a stumble, I can get it to do it pretty much throughout the lower rev range.......whats next?? TPS? I am determined to get to the bottom of it!!

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