Misfire and TPS adjustment issues

[Coan]

Solved the misfire issue! Two bad coils (cylinders 1 and 6). Replaced them with a used set I got off Craigslist and now it runs great.

It still has a slightly high idle sometimes, very rarely though. Looking back through this thread, I didn't mention anything about a high idle until after I messed with the TPS. I'm going to swap the original TPS back in and see what happens.

I'm ecstatic to finally have the car back on the road again!

[Coan]

Originally Posted by Coan

....It had a very metallic sounding tick coming from the engine bay that increased with RPM.....

Also, I solved this by running some Amsoil engine flush through the system. Must have been a sticky lifter as that cleared it right up.

[scoobydrvr]

Originally Posted by Coan

Also, I solved this by running some Amsoil engine flush through the system. Must have been a sticky lifter as that cleared it right up.

I have this same problem. My motor was quiet when we first put it together but its started making this ticking since I've got it back on the road. Is this stuff a gas additive or oil?

*edit*
Just realized how dumb a question that was. Time to see where I can find Amsoil.

[Coan]

Lol, yep it's on oil additive. Pour the bottle in and you're supposed to run the car at "fast idle" for 15-20 minutes. I went for a cruise around the block to help pass the time, very slowly - keeping the rpms below 2000. After a couple minutes the ticking disappeared. I then changed the oil and filter immediately afterwards. No more ticking!

[Coan]

Tonight I readjusted the TPS. It was at .52 volts when I started. I moved it around through it's range and then set it back at .50. Started the car and it gave me a P0120 code (TPS switch A circuit malfunction), probably from me adjusting it. I erased the code and went for a 20 minute drive. No more high idle and my 1-2 shift is noticeably softer (it's always been harsh).

I'm not yet convinced that the idle is fixed. I'll report back in a few days with an update, by then I'll have a pretty good idea if it has been resolved.

[scoobydrvr]

Originally Posted by Coan

Lol, yep it's on oil additive. Pour the bottle in and you're supposed to run the car at "fast idle" for 15-20 minutes. I went for a cruise around the block to help pass the time, very slowly - keeping the rpms below 2000. After a couple minutes the ticking disappeared. I then changed the oil and filter immediately afterwards. No more ticking!

Was your ticking noticable all the time? That is under load, at idle, off idle in neutral/park.
the ticking i'm experiencing sounds just like a lifter but can only be heard when the car is pulling itself. It would be nice if this will take care of it.

[Coan]

If it were a lifter tick it should be whenever the engine is running and would increase with rpms. That's how mine was.

Does your tick increase with speed? Does it increase with rpms? If it's only while driving, and doesn't do it in park or neutral, I would suspect that something else is the cause.

[scoobydrvr]

The ticking is only when it's pulling itself and increases with engine RPMs. I'm really not sure what to make of it; hope it isn't too serious. I wish some of the Suby masters lived nearby, I'd have them give it a listen.

[Tapani]

By "when it's pulling itself" you mean when you are accelerating?

Exhaust leak? A bad manifold gasket (or crack) may sound like a stuck lifter when on the move.

/T

[scoobydrvr]

Originally Posted by Tapani

By "when it's pulling itself" you mean when you are accelerating?

Exhaust leak? A bad manifold gasket (or crack) may sound like a stuck lifter when on the move.

/T

I've wondered if this was the case. Is there a quick and dirty way to check for a leak like this? Seems to me that it would be hard to reproduce while sitting on jack stands.

[Coan]

Originally Posted by Coan

Tonight I readjusted the TPS. It was at .52 volts when I started. I moved it around through it's range and then set it back at .50. Started the car and it gave me a P0120 code (TPS switch A circuit malfunction), probably from me adjusting it. I erased the code and went for a 20 minute drive. No more high idle and my 1-2 shift is noticeably softer (it's always been harsh).

I'm not yet convinced that the idle is fixed. I'll report back in a few days with an update, by then I'll have a pretty good idea if it has been resolved.

Update on this: idle rpms have been perfect ever since adjusting the TPS. That solved it!

I do still feel a VERY faint miss at idle. This was there before all of my troubles (and this thread) started though. It's so faint that it's hardly noticeable. I may try swapping some of the other coils out to see if it goes away.

Regardless, I'm very pleased with how well the car has been running! I forgot how much I love this car!

[Tapani]

Originally Posted by scoobydrvr

I've wondered if this was the case. Is there a quick and dirty way to check for a leak like this? Seems to me that it would be hard to reproduce while sitting on jack stands.

Carefully listen outside when in "D" and have an assistant press the loud pedal a little against brakes. Should be rather easy to pin point.

/T

[trueblue]

"loud pedal" is that the same as the gas pedal?