The Central Hub for DSM Community and Information

For 1990-1999 Mitsubishi Eclipse, Eagle Talon, Plymouth Laser, and Galant VR-4 Owners. This is where the DSM platform history is documented and archived. Log in to help us in our mission, and to remove most ads from the browsing experience.

2G Engine tops out?

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

JSeaba

Probationary Member
12
1
Jul 23, 2025
piedmont, South Dakota
Need some help, just bought this 98 Eclipse GST and when it hits 70-85mph it tops out at 3200 rpms, I know it can go more, I can feel it, but it shutters and won't shift back down into 4th gear when its that high of speed, can someone help?
 
won't shift back down into 4th
I thought for sure this is an automatic. Then I noticed your sig:

Is it an issue downshifting into 4th or is it an issue with lack of power? If the latter, probably just a maintenance issue. Replace your spark plugs and wires and do a boost leak test.

What mods do you have and are you running higher than stock boost?
 
I thought for sure this is an automatic. Then I noticed your sig:


Is it an issue downshifting into 4th or is it an issue with lack of power? If the later, probably just a maintenance issue. Replace your spark plugs and wires and do a boost leak test.

What mods do you have and are you running higher than stock boost?
its not an issue when its downshifting but also is, it wont downshift into 4th at 75-80, pretty much redlines it, and it has power but around 3200rpm in 5th it sputters, ill do that, thank you
 
These might be of some interest:
According to Jacks Trans data, which is for AWD, at about 5k RPM in 4th you're doing 92MPH. That isn't even close to redline. Since FWD has taller gears than AWD, you will be a little higher RPM but still not redline.
Sounds like you might have a synchronizer or clutch issue if it won't engage into 4th when downshifting from 5th. Does it grind when downshifting or upshifting? Have you tried rev matching to see if it will engage?
 
These might be of some interest:
According to Jacks Trans data, which is for AWD, at about 5k RPM in 4th you're doing 92MPH. That isn't even close to redline. Since FWD has taller gears than AWD, you will be a little higher RPM but still not redline.
Sounds like you might have a synchronizer or clutch issue if it won't engage into 4th when downshifting from 5th. Does it grind when downshifting or upshifting? Have you tried rev matching to see if it will engage?
I tried to rev match, but it still goes to redline, and since I bought it only last Friday I don't want to blow up the engine as I don't have money to rebuild etc,

These might be of some interest:
According to Jacks Trans data, which is for AWD, at about 5k RPM in 4th you're doing 92MPH. That isn't even close to redline. Since FWD has taller gears than AWD, you will be a little higher RPM but still not redline.
Sounds like you might have a synchronizer or clutch issue if it won't engage into 4th when downshifting from 5th. Does it grind when downshifting or upshifting? Have you tried rev matching to see if it will engage?
I just looked at the website, the thing is is that when it does hit that 69mph+ range it doesn't want to go any faster and acts like its reclining, it caps at 3200rpm aroind 85mph, and slows down, to 70 ish then speeds up, then hits like a barrier
 
any check engine light? What have you looked at? There are 100 things that could be wrong. Start with the basics. What is your mechanical skill level?
You're still not answering the question. When it redlines is it in neutral or not?
no check engine light, my skill level is low, im going into mechanics however, ngl I can't even find the obd2 port, I have one of those tuner chips that came with the car however I don't trust using it
I believe its in neutral but when I go to shift it and let out on the clutch it starts to redline
 
no check engine light, my skill level is low, im going into mechanics however, ngl I can't even find the obd2 port, I have one of those tuner chips that came with the car however I don't trust using it
I believe its in neutral but when I go to shift it and let out on the clutch it starts to redline
Tuner chip thing??? Elaborate.
Umm....you can't tell if its in gear? If it accelerates in gear then rpms climb that's a clutch issue.
Still 100 things to look at. Have you dont any diagnostics or tuneup etc? Looked at anything even if only visually? Tell us what you've tried so far if anything. Do you know what a misfire feels like? Do you know how to read codes? Do you have a scanner?

One more thing, please do not abbreviate in your posts.
 
2 possibilities then. You're not in gear or something with 4th is broken. Surely I should be obvious if the shifter is in position? Try it with car off also.
I believe I figured it out, the car has a bad air fuel ratio where you can smell gas constantly (i know it needs tuned) but yesterday I drove it and it was sputtering in 2nd at 45mph, I believe its sending too much fuel to the point its drowning itself and losing power
 
I believe I figured it out, the car has a bad air fuel ratio where you can smell gas constantly (i know it needs tuned) but yesterday I drove it and it was sputtering in 2nd at 45mph, I believe its sending too much fuel to the point its drowning itself and losing power
Sounds like you have lots of problems. Your profile shows no mods. This is a bone stock car?
 
no it has mods i just have no idea what the mods are, i know for sure it has a greedy blow off valve, and injen cold air intake
So you have no idea what size injectors? Ecu changes etc? Has the car ever run correctly? How long have you had it. What maintenance/repairs have you done
 
So you have no idea what size injectors? Ecu changes etc? Has the car ever run correctly? How long have you had it. What maintenance/repairs have you done
No clue on the injector size, no clue i know it needs tuned, no clue, how it runs now is how it ran when I got it, I've only had it since the 17th, and just 2-3 days ago did i get plates for it so I can finally drive it around legally, only maintenance I've done is putting door cards on and replacing hatch struts
 
no

clue on the injector size, no clue i know it needs tuned, no clue, how it runs now is how it ran when I got it, I've only had it since the 17th, and just 2-3 days ago did i get plates for it so I can finally drive it around legally, only maintenance I've done is putting door cards on and replacing hatch struts
I would stop driving it or attempting too. Could be any of 100 things. What is your skill level? Do you have a way to datalog? Any check engine light? Have you checked anything? Wiring? Spark plugs? Sensors?

Read this

And this
 
I would stop driving it or attempting too. Could be any if 100 things. What is your skill level? Do you have a way to datalog? Any check engine light? Have you checked anything? Wiring? Spark plugs? Sensors?
hey man, been a long time, probably should've updated sooner, but i took it to my auto tech class in my college and it was the boost tube that goes into the turbo, the last guy didn't tighten it down all the way and it eventually got too loose and thats why I was having trouble driving it, once I tightened it down it drove 100% better.
 
So BOOST LEAK was his issue.
If you haven't already, fill out a vehicle profile, as best you can. As you find more things, update it so we all know what we working with!
Mitsubishi Eclipse, Eagle Talon, Plymouth Laser vehicle profiles, photos, build threads, specs, and information. | DSMtuners.com https://share.google/bivfVshR7HVOyM9Fk
 
Add Value - Be Respectful - No Trolling - No Misinformation - Participate Often!
Support Vendors who Support the DSM Community

Build Thread Updates

Latest Classifieds

Back
Top