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'95 Mis-fire/"Hiccup" Please help!

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Old 10-27-2011, 08:23 PM   #1
Whip Chop [OP] Whip Chop is offline
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'95 Mis-fire/"Hiccup" Please help!

Hey everybody!

I'm almost at my wits end chasing a problem I've had for the past month or so on my 1995 4 cyl 2.7L. This baby has 247k on it and has been like a best friend for me over the years. Up until recently she'd been running like a top with little or no issues with regular maintenance. Let me start all the way at the beginning...

My truck stalled out at a stoplight when attempting to accelerate. Unable to restart I towed the truck to my "favorite" shop. They replaced the plugs and were able to re-start but running very poorly and throwing a number of codes. The replaced the spark plug wires, cap and rotor. I picked up the truck and that is when I noticed the "hiccup" on acceleration over 1800 rpm. I took the truck back and they performed a full pressure fuel injection and system cleaning. This did not fix the issue either and he suggested an ignition module to the tune of $400. I declined as it wasn't throwing any other codes.

A day later the "Check Engine" light came on. I read the code and it was showing P0125 Engine Coolant temp sensor and O2 Sensor 1 Bank 1. I attempted to replace the Engine Coolant temp sensor myself but was unable to locate it. I ended up taking the truck to a different shop an they replaced the O2 sensor, it wasn't showing any other codes but still having the mis-fire/hiccup and he suggested replacing the fuel injectors.

I replaced the injectors myself and it was still having the problem so I took it to the dealer. They found a code stating that O2 sensor 2 wasn't working and replaced. They suggested replacing the plugs, wires, cap and rotor with factory parts (NGK/Denso) as they were all after-market for $385. I declined as I had just paid to have all this replaced and they were less than a month old. This evening after some research and suggestions to make sure I had NGK brand plugs in there I pulled the plugs I had and found that they were Autolite platinums. I pulled and replaced with NGK G-Power plugs. Still having the hiccup issue although there is a *slight* improvement in that it is somewhat less-severe.

Any help from anyone with some similar experience with this issue would be MUCH appreciated. I am very frustrated at this point and don't know what the solution is without replacing the cap, rotor, wires again into another expense. Everyone I know who has or has had a taco looks at me funny when I start contemplating selling it as I don't want to nickle and dime everything. Maybe it's time but I was hoping to get 300k at least out of it. Thanks for your time.
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Old 10-27-2011, 08:44 PM   #2
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Well. I had very simalir problems with my 96 2.4. It was a #of things though. Plugs and wires. Had a mouse living in the air box. Also both ox2 sensors were bad. Plus my distrubutor was bad. So good luck. And sorry to depress you. But I have 265k and it still runs like a top. Actually way more peppy than my 2.7 4x4 with 150k less miles.
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Old 10-27-2011, 08:48 PM   #3
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Thank you for the reply so far. I know that it can be fixed, I just wish I could narrow it down some more. I want this thing to keep purring.

Neglected to mention, dealer checked compression, fuel pressure, fuel pump, exhaust system, etc. All checked fine. Not showing any codes at this point.
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Old 11-17-2011, 06:36 PM   #4
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An update on the progress. Ended up replacing an ignition coil with a factory one and that has fixed the hiccup so far. Not sure why. However, when I start the engine now anytime after the initial startup for the day, it takes some extra cranks to start and sometimes stumbles a second then runs just fine. Any suggestions? I just put some sea foam in the gas tank.
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Old 06-24-2012, 05:33 PM   #5
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I had a problem with my 1995 2.4L...over 18 months ago. Hic ups for a long time, changed out plugs, wires, coils..nothing help, then head gasket went. I used Blue Devil on & worked until now, now I am getting price to fix. Then I will need to fix hic ups, I have sure cure for humans but not cars. Did you say you changed O2 sensor yourself, (only one) , how hard was it.....???
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