| Author |
Message |
L.C.Plester (Lcplester)
New member
Username: Lcplester
Post Number: 20
Registered: 2-2002
| | Posted on Wednesday, April 17, 2002 - 7:34 am: | |
I wouldn�t be too worried. I have European spec car (so no cats) and my car really hates running around 2700-2800 rpm - meaning it doesn�t pull of cleanly in those revs, just 100rpm more and it goes very smoothly (I guess this is around the same rpm area as in your car). I think this has something to do with the engine design of the flat 12. I�m quite sure there�s nothing wrong with the engine. Otherwise my engine runs very smoothly even when using the 5th gear and only about 1xxx rpm on meter. |
Brian stewart (Eurocardoc)
Member
Username: Eurocardoc
Post Number: 260
Registered: 11-2001
| | Posted on Tuesday, April 16, 2002 - 8:56 pm: | |
Check the ignition advance curve, it can be done with a regular timing light, the specs. are in the shop manual. It could be the Digiplex, that sets the advance per rpm. Used available at GT Carparts around a $G-note. |
Adam Goldman '86 TR (Icnsltmfg)
Member
Username: Icnsltmfg
Post Number: 304
Registered: 8-2001
| | Posted on Tuesday, April 16, 2002 - 5:36 pm: | |
Ernest;
Mine is over at the Mechanic today and he thinks it may be an adjustment with either the two throttle bodies or a fuel management adjustment. I will let you know if that solves it. |
Ernest Riggen (Ernest)
New member
Username: Ernest
Post Number: 12
Registered: 4-2002
| | Posted on Tuesday, April 16, 2002 - 10:37 am: | |
To all -
Although I haven't concluded all of my tests, I can report that a can of fuel injector cleaner seems to have made a difference. I think I'll dump another through.
Thanks.
Ernest. |
Kelly J. Vince (Tifosi1)
Junior Member
Username: Tifosi1
Post Number: 207
Registered: 2-2002
| | Posted on Sunday, April 14, 2002 - 9:48 pm: | |
Ernest,
This may sound cary, but I had the same problem with my mother's Crown Vic. Only at a certain speed would it miss.
I put in new plug wires and it fixed the problem. After looking at what we would call the extenders, I found the wire. There was small hole in the extender. I guess at the right AMPS, it would spark to the head causeing the miss.
Hope this helps.
Kelly |
Edward Gault (Irfgt)
Intermediate Member
Username: Irfgt
Post Number: 1067
Registered: 2-2001
| | Posted on Sunday, April 14, 2002 - 9:38 pm: | |
I am not a TR expert but everyones description sounds like an EGR valve problem on a comparably equipped engine. I am not sure if a TR has an EGR valve but if it does I would try disconnecting the vacuum hose from it and running the car to see if the problem goes away. |
Adam Goldman '86 TR (Icnsltmfg)
Member
Username: Icnsltmfg
Post Number: 303
Registered: 8-2001
| | Posted on Sunday, April 14, 2002 - 9:13 pm: | |
Ernest;
Mine is doing the same thing in every gear at 3K. I replaced Rotors, caps, wires, and plugs. It is going in for this on tuesday and we will put it on the inspection roller's (NJ inspection thing good for something at least) and try and figure out what the problem is. It may be a bad coil. I will let you know on Tuesday what we find out. |
Ernest Riggen (Ernest)
New member
Username: Ernest
Post Number: 10
Registered: 4-2002
| | Posted on Sunday, April 14, 2002 - 6:28 pm: | |
Here's the latest -
I replaced the plugs today - I'll start easy since I just received the car. The old ones look fine, beautiful dusty grey for 7-12 and only slightly darker for 1-6. No wet, oil or gas.
The car DOES accelerate perfectly in any gear, even 5th from 1800 - 6500.
The problem comes when you stick at ~2500 in 4th or 5th which happens to be 60 MPH. At that point it acts like it's being lugged. Slight acceleration only aggravates. Hard acceleration no problem. Doesn't seem to do it in the lower gears.
I'm next checking differences between hot and cold, plus I dumped in injector cleaner today.
Thanks for the continued support.
BTW - plugs are much easier than the Pantera!
Ernest. |
Arnaldo Torres (Caribe)
Member
Username: Caribe
Post Number: 276
Registered: 2-2001
| | Posted on Saturday, April 13, 2002 - 8:17 pm: | |
Ernest, I agree with Vince, you seem to have a problem. My 90 TR does not jerk at any reasonable RPM, sometimes I let it rev-down (I believe I had let it go down below 1500 RPM in some occasions) in 5th gear (normally in heavy traffic to avoid shifting) before stepping on the accelerator. The car revs-up slowly at first, but never with jerkiness or any indication that it is going to stall. I am always amazed with these engines. Anyway, I hope you find what's going on soon! |
vince porto (Vince)
New member
Username: Vince
Post Number: 4
Registered: 3-2002
| | Posted on Saturday, April 13, 2002 - 3:31 pm: | |
Put the car in 5th... drop to 1800 rpm. Stomp the throttle and the car should accellerate like an electric motor. Slowly at first, but perfectly seamless. If it doesn't - you've a problem to correct.
"...most of the last 18 months being started, moved, and shut off"
Do you have clean, fresh fuel?
If the fuel is 18 months old it's likely your problem... drain it out before you gum your injectors.
Run some fuel injector cleaner and a fresh tank of high octane fuel (I use Techron by Chevron each spring and Chevron fuel). Same brand likely assures best compatability. Try to run it through the system in only one or two drives - don't let it set for any serious time. Get it hot, keep it hot and DRIVE.
Then change out your fuel filters.
If it still stumbles, check plugs, wires, cap... then perhaps the injectors. Suggest 'hands off' the FI system until all else is confirmed 'OK'.
Rgds,
Vince
TR#83598 |
Ernest Riggen (Ernest)
New member
Username: Ernest
Post Number: 4
Registered: 4-2002
| | Posted on Friday, April 12, 2002 - 7:16 pm: | |
All great comments, if I drop a gear to stay in the rev range, that means I'm in fourth whenever I'm at speed limit (Argghhh). Is that what you other TR drivers are doing? What should the rev range be? I like the thought of Christian's turbine like performance. No difference really between hot and cold Tom. I will check plug wires and the plugs. I haven't replaced them yet (this weekend) and the car has spent most of the last 18 months being started, moved, and shut off.
Thanks for the comments.
Ernest. |
Christian (Christiank)
Member
Username: Christiank
Post Number: 309
Registered: 1-2001
| | Posted on Friday, April 12, 2002 - 9:22 am: | |
My TR runs smooth in all gears from 1,000 to 6,800. Almost like a turbine. I would look at the ignition caps, rotors, spark plug wires first. |
Brian stewart (Eurocardoc)
Junior Member
Username: Eurocardoc
Post Number: 249
Registered: 11-2001
| | Posted on Friday, April 12, 2002 - 7:06 am: | |
Typically 4 valve engines work better at higher rpm, and at low speed are a little lacking. When VW introduced the 16v Golf, people complained about off the line performance because of the engine characteristics. As owners of turbo porsches know, use the gearshift, drop a gear when necessary to stay in the rev range. |
TomD (Tifosi)
Member
Username: Tifosi
Post Number: 520
Registered: 9-2001
| | Posted on Friday, April 12, 2002 - 6:55 am: | |
Ernest
It is possible that your tach is off so running at 2500 rpm could really be 2000 or less. Nevertheless probably not enough to cause jerkyness unless it is way off. Does it happen in other gears? more when car is cold or hot? |
Michael N. (Man90tr)
Member
Username: Man90tr
Post Number: 496
Registered: 4-2001
| | Posted on Friday, April 12, 2002 - 3:36 am: | |
Sounds correct, The engine runs best at 4000 and above. Very limited power below 3500. Mine is not jerky down there, but I can easily how that can happen. I drive my car between 3500 and 6800. |
Ernest Riggen (Ernest)
New member
Username: Ernest
Post Number: 3
Registered: 4-2002
| | Posted on Thursday, April 11, 2002 - 8:10 pm: | |
I'm sure this group gets these kind of questions all the time but ...
Mine hates running in 4th or 5th at 2500 RPM. It runs jerky almost like I'm lugging it. If I try to hold it or accelerate slowly it only gets worse. Above 3000 is fine.
If it's related, it also has a nasty (or wonderful) increase in the power curve at about 4500 when agressively accelerating, lower if I really step on the accelerator.
ANy ideas would be great!
Thanks.
Ernest. |