 Starts out smooth, then what the buck? |
|
|
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
|
| Jesco Reient |
 Dec 18 2013, 06:24 PM
Post
#1
|
|
Member  Group: Members Posts: 135 Joined: 18-July 12 From: Western Washington Member No.: 14,690 Region Association: Pacific Northwest  |
When I first start the car cold for the day. (2056, D-jet, Raby 9590 cam, timing 27 advance @3500) The car has no cold start valve but has not seemed to care. First start it runs smoothly pulls away from the house shifting @ 3500 it acts nicely. After warming up for awhile as the motor reaches 3200 to 3600 it bucks severely then above 3600 it smooths out a bit. Then as it gets warmer the bucking moves down the RPM range to 2600 to 2800 RPM becoming not very drivable. any ideas out there? (IMG:style_emoticons/default/confused24.gif)
|
   |
 
|
  |
Replies
| rhodyguy |
Dec 20 2013, 11:22 AM
Post
#2
|
|
Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,098 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
have you calibrated the tps using a proper plug, jumper wires, and your multlmeter?
|
|
|
|
| Jesco Reient |
Jan 22 2014, 06:59 PM
Post
#3
|
|
Member Group: Members Posts: 135 Joined: 18-July 12 From: Western Washington Member No.: 14,690 Region Association: Pacific Northwest |
QUOTE(rhodyguy @ Dec 20 2013, 09:22 AM)  have you calibrated the tps using a proper plug, jumper wires, and your multlmeter? Hey I'm back, So The Ford motor is disassembled and I'm back in the shop with the 914, As suggested I tried running the head temp sensor to ground to see if that changed anything, not really So it's hooked back up now. Next I'm adjusting the TPS again with the multi-meter. Next after that I'm checking the Manifold Pressure Sensor Diaphragm. It feels like it's closer to carburetors everyday. Argghhh |
|
|
|
| rmital |
Jan 23 2014, 11:28 AM
Post
#4
|
|
Northeast optimist Group: Members Posts: 1,947 Joined: 12-December 05 From: Park Ridge, NJ Member No.: 5,268 |
QUOTE(Jesco Reient @ Jan 22 2014, 07:59 PM) ............As suggested I tried running the head temp sensor to ground to see if that changed anything, not really So it's hooked back up now. ............ just to be perfectly clear....you are NOT running the head temp sensor to ground. you would run a wire from the pigtail connection from the harness that connects to the head sensor to ground (negative on the battery) your taking the CHT out of the equation. |
|
|
|
Posts in this topic
Jesco Reient Starts out smooth, then what the buck? Dec 18 2013, 06:24 PM
boxsterfan
When I first start the car cold for the day. (205... Dec 18 2013, 06:32 PM Jesco Reient
Could be TPS worn, trigger points on dizzy or fu... Dec 18 2013, 07:57 PM boxsterfan Also, how about your fuel filter? Clogged?
Or a ... Dec 19 2013, 10:57 AM
Jesco Reient
Also, how about your fuel filter? Clogged?
Or a... Dec 19 2013, 11:46 PM r_towle
r_towle
"What is your valve train setup?
Al... Dec 20 2013, 10:48 AM r_towle What is your valve train setup?
Aluminum or chromo... Dec 19 2013, 12:13 PM rick 918-S From the sounds of your last post about going thro... Dec 19 2013, 03:44 PM gothspeed The above is good advice ..... the only thing I... Dec 19 2013, 08:18 PM rmital
The above is good advice ..... the only thing I... Dec 19 2013, 08:36 PM Mike Bellis What everyone is eluding to here is you have a lea... Dec 19 2013, 08:29 PM gunny I had the same type of issue and after about a yea... Dec 19 2013, 08:29 PM 914GT Maybe try retarding the timing a few degrees and s... Dec 19 2013, 09:16 PM r_towle Runs good cold, run worse when hot.
Metal expands ... Dec 19 2013, 09:40 PM rick 918-S
Runs good cold, run worse when hot.
Metal expands... Dec 19 2013, 10:28 PM Jesco Reient
Runs good cold, run worse when hot.
Metal expand... Dec 20 2013, 08:41 AM rick 918-S You may want to re-run a test on your MAPS too jus... Dec 20 2013, 06:42 AM gunny http://www.aemelectronics.com/wideband-air...-fuel... Dec 20 2013, 07:15 AM boxsterfan http://members.rennlist.com/pbanders/DJetP...tm#tr... Dec 20 2013, 10:44 AM Jesco Reient
............As suggested I tried running the hea... Jan 23 2014, 02:44 PM gunny If the issue is RPM sensitive and not throttle pos... Dec 20 2013, 11:40 AM Jesco Reient
If the issue is RPM sensitive and not throttle po... Dec 20 2013, 04:23 PM Jesco Reient Today has been a research and reading day, letting... Dec 20 2013, 04:22 PM Java2570 I've seen a lot of other threads with folks us... Jan 23 2014, 07:54 AM mepstein I had bucking sometimes and a perfect running engi... Jan 23 2014, 09:09 AM Jesco Reient
I had bucking sometimes and a perfect running eng... Jan 23 2014, 09:37 AM r_towle
I had bucking sometimes and a perfect running en... Jan 23 2014, 01:37 PM Jesco Reient OK, todays test drive revealed a nice smooth pull ... Jan 23 2014, 07:55 PM |
2 User(s) are reading this topic (2 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 15th June 2024 - 01:26 PM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.