Ryan_Alswede

Hey guys, haven't posted a question in a while. Ok I still have that hesitation problem, gets annoying. Like you hit the gas it jumps up but then bogs, loss of power till you work your way up to 2500 then it comes to life. I've done a full tune up and everything is tip top shape under the hood. I've read thru the old posts and people say it might be timing chain so I did the test with the timing light and the mark does move maybe a degree or too each way. So is that it, I find it had to belive it could make that big a diffference. I have 88,000 plus silent miles. I've had other push rod engines go to 170,000 or more no problem with the chain, it the GM chain that crapy.

Nixon1

Only 88 grand? Nice.... Sounds like a pretty bad problem though for the timing chain at only 88,000...my car's got 105,000 on the original chain and it's only got a slight rough idle/idle bog.. What do you idle at? And does the car shake/vibrate at idle?

Ryan_Alswede

Hmm well there is some rough points at idle but I don't mind, it just that bog in 1st gear that annoys me. All other gears and power bands are fine. The tech shows 1000 but when they do the emissions test where they read off the spark plug leads it idles about 760 in drive and about 800 in park.

TomP

I think Karl said if you can remove the distributor cap and twist the rotor (by hand) side to side, the chain is loose. I changed my chain at 189,000 miles, it doesn't sound like it could be your chain, either.

I wonder if your TPS is bad... do you have an analog meter? If you run a meter on the TPS and work the throttle from idle to WOT (engine off!! ), the analog multimeter should show a smooth "swing". If the needle jumps all over the place, the TPS is bad. I don't have a 90-92 3.1 manual, but maybe someone can post a test (or some voltages) for the 90-92 TPS?

Nixon1

Analog multimeter huh....those pretty easy to find Tom? I figure while you're on the TPS hunch I might as well check mine out cause I've had a little suspicion that mine's a little on the funny side. Where exactly is the TPS located?

Ryan_Alswede

Well I can say this TomP, my TPS is brand new so thats not it, it just has me stuck on what it could be. My O2 sensor is working perfect according to the emission read out. My MAP sensor is brand new. I have a fairly new MSD coil. My timing is dead on in drive. No vacum leaks. My pick up coil and module are fairly new as in with in 2 years. wires are all good and not jumping to ground any where.

Gumby

been through that myself. it was caused by the coil leaking, at night it was a nice light show. but it was not the coil. plugs wires cap and rotor fix it up. even though it was not time ofr a change.


same problem as you have, went through it all, egr,tps,relays but just needed a good tuneup.

Ryan_Alswede

LOL well that brings up another great and intreging question. I've tryed 5 coils, 3 stock ACDelco ones, 2 MSD coils All of which glow around the square part, I always forget to look in the dark when the coil is new, does it leak when they are new.

I think your right though about the coils, that GM design just never looks right in the dark.

Is the answer to get what I call the Coca Cola MSD coil, if so does any body have a wiring dirgram on how to wire one of those 2 terminals in to the 4 wires that GM has going to their coil so that it still allows everything to work and lets the stock dash tech work too.

Gumby

I went through a bunch of coils and they never lasted more than a week. after a good tune up I was able to put my accel coil back on.

all of them would light up around the square part. new plugs wires cap n rotor fiex it up.

Ryan_Alswede

Would they do it the FIRST day that you put them on??? Maybe thats normal, I'm trying to find out.

Gumby

yea they would do it the first day, I went through 3 stock coils befor I put my accel coil back on. If the coil is leaking its not the coil, but a butt load od resistance somewhere else not letting it discharge right.

Ryan_Alswede

Well the resistance is the spark plug gap itself, if it can find an easier path to ground then the plug it will. You say you went thru 3 stock coils, did they finally fail as in they shorted out and not produce any spark at all?? Weird that it would do it from day one, maybe thats the crona (magnetic feild) effect that we are seeing??

Gumby

no the coils would leak around the metal square. and THE SAME THING AS HIM, CAR WOULD ACT FUNNY TILL AROUND 2500 rpm and then take off. all of them would work for a bit them start acting up. good tune up and I am back using my accel coil.


I did it all, EGR, TPS,fuel filter,pump relays, everything under the sun and it just needed a good tuneup even though it was not time for a good tune-up.

my cap n torotr was good, plug were not that old, wies were still the ones that came on the car but they were good 8s.

Ryan_Alswede

Is your accel coil the plug in replacement??

Have you ever check your accel coil? I'll bet it leaks around the square too, go look tonight in the dark. I'm using a MSD plug in replacement and it glows too and I have 8mm wires, new cap, pick up coil, new plugs, new roter new module.