Car Shaking when warm - no codes

[Blade2001]

I got bit of a problem with my 87T. Car starts out fine in the morning. After driving for 10 miles or so on highway, when I come to a stop (like in the exit), the car developes this shaking as if it is going to stall.. Car usually idles around 800 (kinda high for turbo), but when the shaking begins, rmp drops to 650... EGT drops from 950 - 1000 deg F in normal Idle to 750 deg F during this shaking event. When I give gas, the shaking gets worse.. then few minutes later, the shaking goes away.. shaking comes and goes at random interval.

No codes registered (checked). From my search in this forum, I saw people had injector wiring issues.. I wiggled the wires to injectors to see if it improves.. no luck yet.. any help appreciated..

Regards,

 

[87mgte]

I got bit of a problem with my 87T. Car starts out fine in the morning. After driving for 10 miles or so on highway, when I come to a stop (like in the exit), the car developes this shaking as if it is going to stall.. Car usually idles around 800 (kinda high for turbo), but when the shaking begins, rmp drops to 650... EGT drops from 950 - 1000 deg F in normal Idle to 750 deg F during this shaking event. When I give gas, the shaking gets worse.. then few minutes later, the shaking goes away.. shaking comes and goes at random interval.

No codes registered (checked). From my search in this forum, I saw people had injector wiring issues.. I wiggled the wires to injectors to see if it improves.. no luck yet.. any help appreciated..

Regards,

Check to see how your plugs and wires are doin. I.E. look under the valley cover and see if there's any oil down there. My car did what sounds like the same kind of thing, but mine usually did it while I was cruising.

 

[Blade2001]

I replaced the plugs this weekend, made sure the plug wires are tight, made sure the injector pluggs are tight.. but no avail.. still got the shaking car with low EGTs.. How would I know if this is related to any of the injector not functioning correct ?

Boost gauge still shows same vaccum with or without engine shake (or bogging out)..

 

[Blade2001]

Could it be caused by a bad EGR valve ? if so, shouldn't I get a code?

 

[suprahooked]

Check the harmoncia balancer, crank shaft pully could be lose.

 

[Blade2001]

Found the problem today.. It was the #6 cylinder injector wiring was at fault. This is the last time I use crimb connectors for injector wiring.. after soldering, problem went away.. thanks for all the replies..