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post #1 of 19 Old 01-03-2017, 12:34 PM Thread Starter
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3.3L coughing in the midrange

My 95 Voyager just started "coughing" in the midrange. Trying to pinpoint what's causing the issue.

Normal driving it seems fine, WOT it seems fine. In-between (1/2-3/4) throttle around 3k-around 4k I get what sounds like backfiring through the intake.

Recently replaced a leaky fuel rail, so I'm leaning towards a possible intake manifold gasket leak, but I haven't had time to dig into it yet.
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post #2 of 19 Old 01-05-2017, 06:40 AM
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Re: 3.3L coughing in the midrange

Backfiring through the intake usually indicates a problem with fuel/ignition not happening at the proper time and/or in the proper amounts.

Are any fault codes stored in memory?

If no, here are Chryslers diagnostics for driveabilty issues with no fault codes or codes 51/52.

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post #3 of 19 Old 01-05-2017, 07:17 AM Thread Starter
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Re: 3.3L coughing in the midrange

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Backfiring through the intake usually indicates a problem with fuel/ignition not happening at the proper time and/or in the proper amounts.

Are any fault codes stored in memory?

If no, here are Chryslers diagnostics for driveabilty issues with no fault codes or codes 51/52.
I will start checking everything once we get some warm weather back, not dealing with it in 0* weather.
I have no fault codes, sorry for not giving that info.
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post #4 of 19 Old 01-05-2017, 06:59 PM
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Re: 3.3L coughing in the midrange

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I will start checking everything once we get some warm weather back, not dealing with it in 0* weather.
Being you are in Wisconsin I am guessing sometime in May...???
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post #5 of 19 Old 01-06-2017, 06:43 AM Thread Starter
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Re: 3.3L coughing in the midrange

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Being you are in Wisconsin I am guessing sometime in May...???
Probably make use of my friend's shop this weekend or next and deal with both my vans at once. Gotta love friend's with heated shops.
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post #6 of 19 Old 01-09-2017, 07:23 AM Thread Starter
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Re: 3.3L coughing in the midrange

Filled it up with gas Friday night, hasn't given me any issues since. Must have just gotten a tank of bad gas.
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post #7 of 19 Old 01-10-2017, 11:24 AM
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Re: 3.3L coughing in the midrange

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Filled it up with gas Friday night, hasn't given me any issues since. Must have just gotten a tank of bad gas.
Is this the van you bought last year? Maybe there's some trash in the tank that got caught on the filter. You might want to keep it over a half tank until you have time to drop the whole thing and flush it.
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post #8 of 19 Old 01-11-2017, 07:10 AM Thread Starter
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Re: 3.3L coughing in the midrange

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Is this the van you bought last year? Maybe there's some trash in the tank that got caught on the filter. You might want to keep it over a half tank until you have time to drop the whole thing and flush it.
No this is the 95 Sport that we've had for a while. The tank has been out of it and cleaned, when I put the new pump and sending unit in.

It's not the first time I've gotten bad gas from one of the local stations, had it happen a couple times on my car as well.
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post #9 of 19 Old 01-11-2017, 11:16 AM
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Re: 3.3L coughing in the midrange

Ew... sounds like your gas stations suck.
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post #10 of 19 Old 01-11-2017, 12:04 PM Thread Starter
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Re: 3.3L coughing in the midrange

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Ew... sounds like your gas stations suck.
They are very hit or miss. I usually put gas in at the kwik trip by my work, but sometimes I have to use the BP or Cenex in town. Most times they're fine, sometimes I get shit gas and have to go through my vehicle running like shit for a week.
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post #11 of 19 Old 01-11-2017, 04:14 PM
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Re: 3.3L coughing in the midrange

I only run Shell or Valero in my turbo cars. I'll resort to an Exxon or Mobil in a pinch, but there are so many of the other 2 around here it's never a problem. I would like to say I'm surprised you have trouble with BP gas, but I'm really not.
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post #12 of 19 Old 01-11-2017, 05:35 PM Thread Starter
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Re: 3.3L coughing in the midrange

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I only run Shell or Valero in my turbo cars. I'll resort to an Exxon or Mobil in a pinch, but there are so many of the other 2 around here it's never a problem. I would like to say I'm surprised you have trouble with BP gas, but I'm really not.
Never had an issue with kwik trip gas. BP is usually ok except their no-eth premium seems to be junk. Cenex's regular is hit and miss, but their no-eth premium has never given me issue.
We don't have Shell or Mobil unless I go 20miles south, so I'm kinda outta luck there.

The 95 seems to run much better and get far better mileage on the no-eth premium, but I hate paying the extra $.40-.50/gal to put it in, so I usually just run regular 87.
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post #13 of 19 Old 01-12-2017, 09:20 AM
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Re: 3.3L coughing in the midrange

Around here, we're almost $1 higher for premium in places. The Shell next to my house does premium for mid-grade cost on Tuesdays, so I always fill up then.
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post #14 of 19 Old 01-12-2017, 06:32 PM
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Re: 3.3L coughing in the midrange

There are no advantages to running premium in a car that does not require the higher octane, only disadvantages.

This TSB was released in 1997 but applies to all cars.





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post #15 of 19 Old 01-13-2017, 02:24 PM
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Re: 3.3L coughing in the midrange

With one caveat NAJ - premium gas is not mandated to contain ethanol (at least not everywhere). Ethanol is nasty stuff. It corrodes things and gums up fuel systems. I still run 87 in my XJ, but I regularly add Seafoam to keep things clear. If I wasn't planning on driving the truck for a few months, I'd probably get as much 87 out as I could and put some premium in. Otherwise, yeah, don't run premium if your engine doesn't need it. Waste of money plus all the stuff listed above.
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