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Old 04-20-2014, 10:26 PM   #1
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TJ backfiring from intake manifold

Hey everyone,

Need some help. So a friend of mine has a 97 TJ with a 4.0 straight 6 manual transmission and norther friend of ours installed a new header back exhaust (magnaflow) and also replaced the spark plugs and distributor cap and the other friend didn't mark the wires for spark plugs. Found out after jeep wouldn't start. We believe we have them in correct order but now we are getting a backfire from intake manifold. No other issues. It idols at normal 900-1000 RPM's any help. We have someone that thinks it's something blocking the cat converter backwards

Any help would be appreciated.

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Old 04-20-2014, 10:34 PM   #2
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First thing I would check is to make sure both rotor and distributor cap are seated correctly, also recheck your plug wires and make sure you have the firing order right.

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Old 04-22-2014, 10:10 PM   #3
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Ok so we are still having issues.
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Old 04-22-2014, 10:16 PM   #4
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1-5-3-6-2-4 (#1 is the front cylinder)
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Old 04-22-2014, 10:42 PM   #5
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Was the distributor rotated ?? If so you need to check the timing.
If firing order is correct, check for cracked cap or rotor.
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Old 04-22-2014, 11:34 PM   #6
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Thanks going to check on it and I'll update. Oh distributor was not moved.
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Old 04-22-2014, 11:36 PM   #7
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Quote:
Originally Posted by cr wrang View Post
Was the distributor rotated ?? If so you need to check the timing. If firing order is correct, check for cracked cap or rotor.
Dumb question but what cap are you referring to?? Thanks
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Old 04-22-2014, 11:41 PM   #8
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distributor cap
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Old 04-22-2014, 11:47 PM   #9
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Ok so here's a quick update.

He was getting an o2 sensor code and the cat and sensor were shot so another buddy replaced sensor and got a magma flow direct fit down pipe and cat then engine misfiring and backfiring through intake manifold. Replaced plugs wires distributor cap and rotary and body. Checked the firing order and it's good. Still lost going to check timing and will find out. Update in the AM

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