Runs progressively worse until parked for long term.
10-20-2016, 12:59 AM
#1
Melting Slicks
Thread Starter
Runs progressively worse until parked for long term.
Just like the title says, car runs progressively worse from the start of each year, but after sitting all winter it's good. Thought I had it last year with the new computer just before I parked it, but it's acting up again.
I'm parking it anyway but I'd like to drive it more than a couple months before having to park it. 86 tpi No codes. Injectors? I've cleaned the maf recently.
I'm parking it anyway but I'd like to drive it more than a couple months before having to park it. 86 tpi No codes. Injectors? I've cleaned the maf recently.
Last edited by BOOT77; 10-20-2016 at 03:23 AM.
10-20-2016, 07:12 AM
#2
That is a strange one I would start with fuel pressure. Tape a gauge to the windshield and report back.
10-20-2016, 07:39 AM
#3
Melting Slicks
Thread Starter
Yah been awhile since I done that, but it's no longer insurance I'll add that to my spring check list THX
Just also occurred to me I haven't gotten to replacing the 90k timing chain and I drag the car so maybe I'd better get to that LOL
Just also occurred to me I haven't gotten to replacing the 90k timing chain and I drag the car so maybe I'd better get to that LOL
10-20-2016, 10:24 AM
#4
Team Owner
Pro Mechanic
10-20-2016, 10:48 AM
#5
Melting Slicks
Thread Starter
It might be if I fixed it last yr and this is a new problem
10-20-2016, 11:28 AM
#6
Team Owner
Pro Mechanic
Say what? I'm not following you, I guess...
Timing chains don't fix themselves while sitting all winter. The problem, as you have described it in your first post, is not symptomatic of a timing chain at all.
Timing chains don't fix themselves while sitting all winter. The problem, as you have described it in your first post, is not symptomatic of a timing chain at all.
10-20-2016, 11:34 AM
#7
Melting Slicks
Thread Starter
I'm saying maybe it's not the same thing this time!
edit: and now it's the timing chain.
edit: and now it's the timing chain.
Last edited by BOOT77; 10-20-2016 at 11:35 AM.
10-20-2016, 11:55 AM
#8
Team Owner
Pro Mechanic
Still makes no sense...based on your description. If a timing chain were a 'cause', the way it would manifest itself would be in a "skipped tooth", which is incredibly unlikely on a 90 k chain, and the symptoms would be both immediate, and dramatic (it would likely stop running altogether).
10-23-2016, 08:08 AM
#9
Le Mans Master
Still makes no sense...based on your description. If a timing chain were a 'cause', the way it would manifest itself would be in a "skipped tooth", which is incredibly unlikely on a 90 k chain, and the symptoms would be both immediate, and dramatic (it would likely stop running altogether).
Last edited by C409; 10-23-2016 at 08:12 AM.
10-23-2016, 11:12 AM
#10
Melting Slicks
Thread Starter
Didn't say it skipped, might of stretched good since stock chains can go pretty far or idk if this yr had a plastic gear that is worn badly. It was just starting to run worse before I parked it, but not horrible yet. Still some of the same stuff like low end loss and some det like before. If I listed all that had been done or checked recent, you'd see why I am thinking outside the box. Plan was to upgrade pan and t-chain set anyway(I already own), I just never got to it this year and if I don't before it gets too cold I'll do it 1st thing next.
10-23-2016, 10:44 PM
#11
Team Owner
Pro Mechanic
Here is some evidence for you; my '96 Silverado currently has the original timing chain in it. It tows my boat on 600+ mile, weekend, round trips through the rocky mountains to Lake Powell and back. So there are some 3rd gear, 5000 RPM stints that last 10, 15 minutes straight? IOW, it's been hammered. 290,000 miles, currently and it runs like new. Like new. No loss of low end tq, no detonation...no symptoms that you're describing. I'm sure my chain is a loose as a goose. I honestly can't believe it hasn't skipped yet. But no symptoms at all, and that is because you won't see/feel/notice any, until the chain is toast.
Last edited by Tom400CFI; 10-23-2016 at 10:45 PM.
10-24-2016, 04:21 AM
#12
Melting Slicks
Thread Starter
A stretched chain will make the cam/ign timing off and retarded, if you retard your cam 4deg you can loose some low end. The saying is 500rpm per 4deg for power band movements. My mods already have moved my power band up.
I just increased spring pressure on the aftermarket springs I use and went to higher ratio rockers. Plus when I was moving the cars today I herd an odd noise and it might be the chain slapping the cover. I've had a chain break on a 80k motor that I swapped into an s-10.
It's not running terrible, it's off and running a bit worse, I just assumed it was starting to act up like usual again. I know with my street tires it would break them loose at a 15-20 roll in hot weather and now in cold it won't. From a stop it spins them less as well and the tires didn't get any better.
Some people are just more sensitive to small changes in there car.
edit: Also been a tad rich and pops when free revved so that could be the timing off and not giving full combustion. I know the ignition is rock solid I've ben thru it for other reasons.
I just increased spring pressure on the aftermarket springs I use and went to higher ratio rockers. Plus when I was moving the cars today I herd an odd noise and it might be the chain slapping the cover. I've had a chain break on a 80k motor that I swapped into an s-10.
It's not running terrible, it's off and running a bit worse, I just assumed it was starting to act up like usual again. I know with my street tires it would break them loose at a 15-20 roll in hot weather and now in cold it won't. From a stop it spins them less as well and the tires didn't get any better.
Some people are just more sensitive to small changes in there car.
edit: Also been a tad rich and pops when free revved so that could be the timing off and not giving full combustion. I know the ignition is rock solid I've ben thru it for other reasons.
Last edited by BOOT77; 10-24-2016 at 04:24 AM.
10-24-2016, 09:49 AM
#13
Team Owner
Pro Mechanic
O.K.
The problem with this thread is several fold;
1. You haven't actually measured the performance of your car. You say it's off, and imply that your butt is more sensitive than others' butts (?), but SOTP don't work, never has. I'd suggest measuring the performance in some objective way.
2. Timing chain stretch is never going to be noticed, SOTP. The diff is just way too small and happens over way too long a time period.
3. If you chain was slapping on the cover, it would have jumped a tooth by now. Hitting the cover would be incredibly stretched/loose!
4. Backfiring? That's a new symptom (in this thread). Through the intake? Exhaust? Through the intake is symptomatic of too-lean A/F ratio or timing.
5. If you've gone through your ignition, then you must know what the timing is set at...right? As far as it being "rock solid"...weren't you just having issues with it after installing an MSD box?
I wonder if there is a performance issue at all and if there is, I don't think it's your chain and I've given several pretty clear reasons why...but if you think it's the chain....pull the cover and look.
.
The problem with this thread is several fold;
1. You haven't actually measured the performance of your car. You say it's off, and imply that your butt is more sensitive than others' butts (?), but SOTP don't work, never has. I'd suggest measuring the performance in some objective way.
2. Timing chain stretch is never going to be noticed, SOTP. The diff is just way too small and happens over way too long a time period.
3. If you chain was slapping on the cover, it would have jumped a tooth by now. Hitting the cover would be incredibly stretched/loose!
4. Backfiring? That's a new symptom (in this thread). Through the intake? Exhaust? Through the intake is symptomatic of too-lean A/F ratio or timing.
5. If you've gone through your ignition, then you must know what the timing is set at...right? As far as it being "rock solid"...weren't you just having issues with it after installing an MSD box?
I wonder if there is a performance issue at all and if there is, I don't think it's your chain and I've given several pretty clear reasons why...but if you think it's the chain....pull the cover and look.
.
Last edited by Tom400CFI; 10-24-2016 at 09:51 AM.
10-25-2016, 04:26 AM
#15
Melting Slicks
Thread Starter
I reverted the msd swap back to 100% how it was before, power was down with gm module so I decide to swap back to the accel to rule it out.
MPH in 1/4 has dropped, I do test my changes. I tune my cars compared to others as well and it has slowed down or theirs have.
Timing was not checked before the dist was pulled to clean and replace module either time.
All your doing is arguing with me and not presenting an alternative, so it's a waste of time. So many on here just want to argue and have nothing to add. I stopped reading your replies in other threads and will do so in this one.
MPH in 1/4 has dropped, I do test my changes. I tune my cars compared to others as well and it has slowed down or theirs have.
Timing was not checked before the dist was pulled to clean and replace module either time.
All your doing is arguing with me and not presenting an alternative, so it's a waste of time. So many on here just want to argue and have nothing to add. I stopped reading your replies in other threads and will do so in this one.
10-25-2016, 07:26 AM
#16
O2 original?
10-25-2016, 09:42 AM
#17
Melting Slicks
Thread Starter
New, Bosh I think
10-25-2016, 10:04 AM
#18
Team Owner
Pro Mechanic
You're right though; I didn't offer an alternative. If it were my car, I'd re-check:
Timing,
Fuel pressure (esp w/that backfire)
compression
and if all that checked out, valve lift/cam.
10-25-2016, 12:13 PM
#19
Clean your water temp sensor connection.
10-31-2016, 09:20 AM
#20
Melting Slicks
Thread Starter