Twin Turbo Dodge Stealth Miss/ Hesitation Or Stumble At 3000 Rpms

Kabel Technician Hawaii Posted   Latest  
Resolved
Driveability
1994 Dodge Stealth R/T Turbo 3.0L (K 6G72-T) 5-spd (W5MG1) — JB3AN74K4RY032203
Miss/ Stumble At 3000 Rpms

Aloha from hawaii, I have this dodge stealth that is making me scratch my head, it runs smooth at idle with no miss and no engine codes, but when I accelerate past 3000 rpms in any gear it usually starts to miss and stumble, if I drive it hard it goes right by the 3000 rpm mark with no issues but if I drive normally it goes right back to the same behaviour.

I scoped the cam and crank sensors and they look good with no drop outs or issues, I also scoped the transistor to the coil pack and from the pcm to the transistor and the pcm to the transistor looked good on all the wires, the transistor to coil looks all messed up under load so I changed out the coil pack and transistor (both were original) with oem parts and it is slightly better but still has the hesitation/ miss.

I also tried disconnecting the suspention module as it can cause an issue like this but it did not change how it ran.

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Stephen Owner/Technician
California
Stephen
 

Disconnecting the egr help? If there's an EGR amplifier that's torn, it could feed too much egr

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Stephen Owner/Technician
California
Stephen
 

Just add, I would test exhaust back pressure..possible clogged cats

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Disagree
Eric Owner/Technician
Wisconsin
Eric
 

I would start with a FRTD (Flat Rate Test Drive), thanks Albin Moore). Take your vehicle out on a test drive and gather some information please. I would like to see the graphed data with these data pids; TP volts, long and short fuel trim, both oxygen sensor voltages, MAF volume if equipped or MAP, or both, RPM & engine load. Test drive and graph both the normal driving and the hard…

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Bryan Educator
California
Bryan
 

It looks like the vehicle uses a 2 speed fuel pump system. Check fuel pressure and see it pressure drops. The pump may not be putting out enough volume at the high range of the low pressure range. Just a thought. Good luck. Bryan

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Interesting
Kabel Technician
Hawaii
Kabel
 

After reading your comment, I found that there is a bypass at the relay for the dual speed to just put it into high speed and I tried that to verify that it wasnt a switching issue, and it still drove the same. Thanks

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Tom Owner/Technician
Tennessee
Tom
 

I had a Jap vehicle in the shop several years ago that had a similar problem. The ignition system had a poor ground. The coil was not being pulled all the way to ground and this was causing a weak spark. It wouldn't go past 2300 rpm. I don't recall if it would go past that under full throttle. But full throttle is not as hard on the ignition as certain cruise conditions. Think of a traditional…

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Gil Technician
California
Gil
 

Really Jap vehicle

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Off Topic
Tom Owner/Technician
Tennessee
Tom
   

Are you offended by an abbreviation? Really?

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Agree
Funny
Inappropriate
Unprofessional
Gil Technician
California
Gil
 

Thanks cupcake better now

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Inappropriate
Timothy Owner/Technician
Wisconsin
Timothy
 

Well, most dictionaries do describe the phrase as an ethnic slur, so he's got a point. That definition goes back to long ago incidentally. Has nothing to do with ‘snowflakes’…

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Agree
Eric Owner/Technician
Wisconsin
Eric
 

Hi Tim, Off topic I know but, did you survive last night's wind storm? We lost power for a couple hours but otherwise no trees down or damage to home or buildings. Eric

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Timothy Owner/Technician
Wisconsin
Timothy
 

Yeah, it was pretty hairy here as well, what with the gusts hitting fifty+ here. Neighbors lost some pines which still have needles, but all the deciduous trees (no leaves), which had lower wind resistance, survived just fine. No power loss on my side of town, but the north side apparently lost power for most of the day. Totally localized outages…

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Tom Owner/Technician
Tennessee
Tom
   

It is ALSO an abbreviation, and that is how I used it. But people will interpret things as they wish if they have an agenda. But I am ONLY responsible for what I say and my intentions, not what someone else thinks. If someone can not accept that I used it as an abbreviation, their limited thinking is not my concern. If I had said “dom” or "euro" in reference to a car's origin, that would be…

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Agree
Gil Technician
California
Gil
 

Well that’s good to know, I didn’t mean to ruffle and feathers with my post

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Kabel Technician
Hawaii
Kabel
 

I will check that it is being pulled all the way to ground, I know I was checking the spark and it was looking good even under load, also I did check the signal from the PCM to the amplifier and even when the issue is occurring the signal is steady with no issues.

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Justin Technician
California
Justin
 

Another thing to consider is the fuel strategy switches to open loop at wide open throttle and ignores the 02 sensors if I recall . Its mostly Mitsu…..

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Agree
Jim Owner/Technician
North Carolina
Jim
 

Take a look inside the ECU for leaking capacitors, these era (mitsubishi) ECU's were notorious for this as they age.

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John Technician
Ontario
John
 

Being a 94, maybe some injector issues. Restricted or poor spray pattern. Probably sits a fair amount

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Pierre Owner/Technician
California
Pierre
 

Inspect the Spark Plugs. They may not be the correct heat range or gap.

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John Technician
Ontario
John
   

I used to have an eagle talon with a similar engine, and I had to close the gap on the plugs a little tighter than spec or I would get misfires under boost. forgot about that. Loved my Mitsubishi turbo engines..

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Kabel Technician
Hawaii
Kabel
 

I will pull a couple of the spark plugs from the front back to verify, thank you very much, the customer said that the problem was not there before we did the clutch but he had also not driven it for months.

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Kabel Technician
Hawaii
Kabel Resolution
   

Thank you all for the help, after scoping all the sensors and checking the data with the scan tool, found that the mass air flow sensor was just out of spec when the issue was happening, replaced it with a new delphi unit and the vehicle is no longer hesitating or missing.

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