In this case, its a sugestion, not a solution. Besides no one here could diagnose my problem.

Cheers

""Doc"" > wrote in message ...
>
> "Martin Riddle" > wrote in message
> news
> > Another possibility, beyond the EGR and FP, is the ignition pick-up coil.
> > I had the same symptoms, except when cold. The pickup coil had some green
> > corosion on its copper windings that affected its
> > operation.
> >
> > Cheers
>
> That's your solution to everything isn't it!
>
> Doc
>
>
> >
> > "Michael Vosk" > wrote in message
> > om...
> >> I need some help with a problem that despite my best efforts persists.
> >>
> >> The vehicle: 1987 ½ ton 4wd Suburban with 350 TBI, AT, 67K original
> >> miles, all stock
> >>
> >> The problem: on starting from a dead stop, there is an intermittent
> >> severe bog until mid RPMs then acceleration is as normal or near
> >> normal. Sometimes this bog is only on starting; sometimes it is at
> >> the low end of each gear. When the problem is occurring, acceleration
> >> during low RPMs is the same for full pedal, or light pedal. As I
> >> said, the problem is intermittent. When things are working,
> >> acceleration is great throughout and smooth and proportional to pedal
> >> travel. The problem seems to be more prevalent when hot, but does
> >> happen also when dead cold. No error codes are stored. MPG is not
> >> noticeably affected (bad as it ever was). The problem is not
> >> noticeable on the freeway. It seems to happen only on starting from a
> >> stop, and more often after sitting idling for a significant time (more
> >> than a minute or so).
> >>
> >> What I have done: Changed 02, TPS, MAP, TBI gaskets, plugs, wires,
> >> cap, rotor, fuel filter. Checked timing (0 deg with wire
> >> disconnected), fuel pressure (13 psi), all hoses checked for vacuum
> >> leaks. EGR operation checked (by shop). Injector cleaner run though.
> >> Changed gas stations over last 5 tanks. I have tried disconnecting
> >> the 02 sensor but the symptoms are the same (I do get an error code
> >> then though). Same for the EGR system.
> >>
> >> Other: I am not sure how the timing is supposed to work on this, but
> >> here is how it does work. With the test wire connected, timing
> >> appears to be advanced about 10 degrees at idle. When the throttle is
> >> bumped, the timing goes back to zero and climbs with RPM. With the
> >> test wire disconnected, the timing is at zero but the idle hunts a bit
> >> (idle is steady with the test wire connected).
> >>
> >> Thanks for any help you can provide. At this point, I would dump the
> >> TBI and go carb, but the under the hoods in NV eliminate that option.
> >>
> >> Disclaimer: I know some will note the "money I saved" in replacing
> >> all the sensors etc over taking it to a shop. I did take it to one
> >> shop here where they declared the fuel filter to be the culprit. This
> >> was changed by the shop and victory was declared. Of course, when I
> >> insisted on a test drive to verify the problem was solved, the problem
> >> remained. Their next suggestion was to change the harmonic balancer
> >> and the timing belt (timing belt on a 350?). I considered continuing
> >> to dump my wallet, but instead opted to pay them the $170 I owed them
> >> for the filter change and left. Since then, I have heard nothing but
> >> horror stories about mechanics here in Vegas. I was lucky to leave
> >> having spent that little. Many of my office mates have spent
> >> thousands with no results. I simply don't have the time or money to
> >> visit several shops on the slim chance of finding an honest mechanic
> >> here. So, I will be fixing this myself..unless there is a Vegas
> >> mechanic out there willing to let me pay only for service that
> >> actually fixes the problem.
> >>
> >> Regards,
> >> Mike
> >
> >
>
>