99 TL-code 1399 (random/multiple cylinder misfire)

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Feb 25, 2019 | 10:30 PM

ABT420

Thread Starter

2nd Gear

Joined: Feb 2019

Posts: 2

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99 TL-code 1399 (random/multiple cylinder misfire)

My cars CEL just came on this morning when I left to wrk. Lucky I had my obdII reader in the trunk and was only a cpl blocks frm my home. Plugged her in and code 1399 came up w no secondary code(s). I’ve tried scanning the forums here but haven’t seen it or haven’t looked hard enough lol. My guess is a bad spark plug or valve clearance/adjustment 🤞🏼
Not too sure what my first/cheapest step should be to fixing the issue and hoping someone here can help me out 🙏🏼
Appreciate any and all feedback 😁
Thank You in advance 😉 ✌🏼

Feb 26, 2019 | 11:06 AM

whitetiger5

Burning Brakes

Joined: Dec 2003

Posts: 1,194

Likes: 331

From: Newport beach

I went to the top of the 2g forum and searched for "p1399" and found that a lot of solutions for this problem involved inspecting & cleaning the EGR system. followed up by spark plugs, and then coils.

It should take about 5-10 minutes to remove the intake manifold cover and inspect the throttle body passages. if your car's throttle body appears to have clogged EGR ports/passages, that might be all that's needed.

P1399 related threads:

https://acurazine.com/forums/2g-tl-p...solved-965169/

https://acurazine.com/forums/2g-tl-p...-plugs-975075/

EGR cleaning: I wouldn't do it on the car the way this guy did...take the whole thing off and clean it out well. There are other DIY's here in the forum, had a hard time looking for them, but that's probably because I haven't had coffee yet today.