1994 ford explorer xlt

1994 FORD EXPLORER
163,452 MILES • 6 CYL • 2WD • AUTOMATIC
Avatar
BJKOVAC
  • MEMBER
  • 1 POST
my ford explorer 1994 xlt 4.0 engine, it feels like it is miss firing at times and then corrects itselft, l'v change the wires and plugs, and somebody told me it might be a egr valve or oxygen sensor. I'm not sure if this 4.0 has an egr? Would you give me some advice on trouble shooting this problem?
Nov 18, 2010 at 1:30 AM
Avatar
ERNEST CLARK
  • ✓Experienced Mechanic
  • 1,730 POSTS
There's two kinds of misfires, ignition and lean.

If you've eliminated the plugs/wires as the cause, then continue by checking the coils. Because a faulty coil pack could be your problem.

You do this with a spark checker to see if all plugs are firing.

A lean misfire would mean one/more of your fuel injectors are clogged or not firing.

You can listen to each injector with an automotive stethoscope. You'll clearly hear the ticking sound of the injectors firing. If not, replace that one. Next would be a flow test, which of course is more involved.

Finally, your egr valve is located on the drivers side of the engine, in the middle towards the top. It's round and has a vacuum line and exhaust tube connected to it.

I doubt this is your problem, but you can check it anyway.
Nov 18, 2010 at 3:21 AM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle