Car wont accelerate past 2k rpms!!!!
Car wont accelerate past 2k rpms!!!!
While driving one day i started blowing white smoke that smelled just like gas, took it to a mechanic he said injectors were bad so changed all 6 with a plenum pull, after injectors were in car had a problem where after it warms up it will accelerate only until about 2k rpms then starts jerking like it wants to stall until i step off gas. When its in neutral (5speed) it will rev to 2k rpms then wont rev any higher and the rpm needle just bounces up and down from 2k to about 3k rpms. Took it to a specialty z shop and the dude said the injectors i used were bad so changed all 6 to some remans and still same problem. Since then i changed the maf,ptu,iacv and nothing can get it right. Any ideas? Or similar problems?
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evildky
- Posts: 14225
- Joined: Sat Jan 31, 2004 9:23 pm
- Car: 71 Datsun 240ZT
87 Nissan 300ZX N/A-T
06 Nissan 350Z GT
Toyota Tundra TRD RW - Location: Louisville, KY
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Re: Car wont accelerate past 2k rpms!!!!
RPM related issues usually point to the maf or the tps, since you replace the maf I'd start by calibrating the tps, check the ecu for codes.
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skyline084
- Posts: 471
- Joined: Sat Oct 30, 2010 4:23 pm
Re: Car wont accelerate past 2k rpms!!!!
Injectors wouldn't cause an issue like that.. Sorry you were mislead. Check your cas. Use the fsm
Re: Car wont accelerate past 2k rpms!!!!
Wouldnt a bad cas mean the car wont start? My car is starting on first try consistently.skyline084 wrote:Injectors wouldn't cause an issue like that.. Sorry you were mislead. Check your cas. Use the fsm
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DCaff300ZX
- Posts: 4202
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1993 CRP TT- Modified - Location: Tacoma, Washington
Re: Car wont accelerate past 2k rpms!!!!
Unfortunately you have found as many of us have, that few if any mechanics know our car well and can diagnose/fix them accurately.
Your problems quite possibly are due to corrosion of various connectors from the injectors to CAS, IACV, PTU harness, and CTS sensors at the least, if not a failed sensor or bad vacuum hose or two. This causes many of the various systems to work intermittently or at least not up to need, and furthermore doesn't allow the ECU to get correct readings which will often effect driveability.
Get the osm from here and go over EVERYTHING in the car you can test that has to do with driveability, hesitation, and continuity and you should find your problem, or at worst narrow down your possibilities. I myself have been down the same path as you with my TT, and found a LOT of things to fix/service/replace...Good Luck!
Your problems quite possibly are due to corrosion of various connectors from the injectors to CAS, IACV, PTU harness, and CTS sensors at the least, if not a failed sensor or bad vacuum hose or two. This causes many of the various systems to work intermittently or at least not up to need, and furthermore doesn't allow the ECU to get correct readings which will often effect driveability.
Get the osm from here and go over EVERYTHING in the car you can test that has to do with driveability, hesitation, and continuity and you should find your problem, or at worst narrow down your possibilities. I myself have been down the same path as you with my TT, and found a LOT of things to fix/service/replace...Good Luck!
Re: Car wont accelerate past 2k rpms!!!!
to answer your question, you have discovered "limp home mode" nearly all cars come with this feature now. when there is an error the car kicks itself in the balls and lets you slowly drive to the nearest mechanic. that 2krpm loss of power is exactly what happens when you're in limp home mode. now your mechanic might have been right, he might have been wrong. did he flow test your injectors? did he give you a flow report? do you still have your old injectors or did he keep them? or did you believe him because he thought power loss at higher revs was fuel starvation?
It still blows my mind how there are mechanics, even those working in speciality stores that can't recognise a fault mode. my neighbour's ford kept losing power and the reverse gear wouldnt work. the ford stealership told him he needed a transmission rebuild. in about five minutes i'd fixed his transmission by cleaning his butterfly with a rag and resetting the codes. the fly by wire throttle body servo was throwing an over current error from sludge in the throttle body. and the manual states that the reverse gear is disabled in the XR6 on a fault code.
so to answer your question, what is wrong with the car? it costs about 10$ to build a consult cable or something like 30$ to buy one. there's even a free yet painful option of removing the passenger side floor panel and reading the codes or jumping two pins on the consult connector and counting the blinks on the engine light. not all errors will manifest as a blinkable code but ones that trigger limp mode will. post your error codes.
It still blows my mind how there are mechanics, even those working in speciality stores that can't recognise a fault mode. my neighbour's ford kept losing power and the reverse gear wouldnt work. the ford stealership told him he needed a transmission rebuild. in about five minutes i'd fixed his transmission by cleaning his butterfly with a rag and resetting the codes. the fly by wire throttle body servo was throwing an over current error from sludge in the throttle body. and the manual states that the reverse gear is disabled in the XR6 on a fault code.
so to answer your question, what is wrong with the car? it costs about 10$ to build a consult cable or something like 30$ to buy one. there's even a free yet painful option of removing the passenger side floor panel and reading the codes or jumping two pins on the consult connector and counting the blinks on the engine light. not all errors will manifest as a blinkable code but ones that trigger limp mode will. post your error codes.