North American Turbocoupe Organization

88 coupe stalls around 4K rpm and will die or run rough afterj
Boxbaron Offline
Junior Member
Hello everyone, I’ve got a 88 turbo coupe 5 speed, 140k mile all original car. It runs and drives perfect unless I run it hard. At about 4000rpm the engine stalls or quits making power and when I shift it will die and run rough for a couple minutes after. After a couple minutes is starts running fine again. The local mechanics put new plugs, wires, cap rotor and new injector. Checked everything out but it still does the same thing. I would greatly appreciate any info on what I need to do to make it run right?

Jeff K Offline
Sounds to me like weak valve springs causing the HLAs to pump up and hang the valves open at high RPM.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
11 Crown Vic Interceptor
14 Toyota Camry (wifes car)
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized

BJL Offline
i agree with Jeff.weak valve spings and lash adjusters over pumping. my tc does with on cold mornings if i dont let if warm up a while.
i had another TC would this constantly unless i let it fully warm up.
Brian Larkin
88TC 330,000 miles
Slightly Modified

Boxbaron Offline
Junior Member
Thank you very much for the replies. I will try the valve springs. Should I go with a new cam and lifters while I’m In there? I read a lot about people using a ranger roller cam?

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