Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
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.
 

Welcome Guest ( Log In | Register )

> The Hotter it gets, The more problems I have
ne14914
post May 29 2003, 01:01 PM
Post #1


Me N My914
**

Group: Members
Posts: 94
Joined: 4-March 03
From: Los Angeles, Cali (Inland Empire)
Member No.: 388
Its starting to get warm in so cali and i am noticing that my car is starting to run like crap!

Once I get off the freeway, the car act as if it wants to cut off. It idles really low, and doesnt accelerate properly.

The car is a 73 1.7 Fuel Injection - stock. It runs fine when it is cold. This happens even when I dont drive the car hard.

Becoming quite frustrating. Once I cut the car off, it becomes hard to start.

Any recommendations?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
2 Pages V  1 2 >  
 Reply to this topicStart new topic
Replies(1 - 19)
ChrisReale
post May 29 2003, 01:06 PM
Post #2


Sleazy
****

Group: Members
Posts: 2,665
Joined: 20-January 03
From: San Francisco
Member No.: 176
Cylinder head temp sensor sounds suspect. Take an ohm reading with the neg at theground battery terminal, the positive on the cht. Souild read less than 100 ohms fully warmed up
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Brad Roberts
post May 29 2003, 01:10 PM
Post #3


914 Freak!
***************

Group: Members
Posts: 19,148
Joined: 23-December 02
Member No.: 8
Region Association: None
Hum.. vapor lock ?? Just thinking out loud.

I have NEVER had a car vapor lock on me.. but it sounds about right.

B
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
ne14914
post May 29 2003, 01:18 PM
Post #4


Me N My914
**

Group: Members
Posts: 94
Joined: 4-March 03
From: Los Angeles, Cali (Inland Empire)
Member No.: 388
QUOTE
Hum.. vapor lock ?? Just thinking out loud.

I have NEVER had a car vapor lock on me.. but it sounds about right.


What is vapor lock? Sounds like something out of a star trek movie.......
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Brad Roberts
post May 29 2003, 01:19 PM
Post #5


914 Freak!
***************

Group: Members
Posts: 19,148
Joined: 23-December 02
Member No.: 8
Region Association: None
It is when the fuel becomes vapor (from heat) and cannot flow as a liquid. In Texas I used to run the fuel pressure around 29-30 PSI to help allieviate this problem. You may want to check your fuel pressure.

B
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
914werke
post May 29 2003, 01:23 PM
Post #6


"I got blisters on me fingers"
**********

Group: Members
Posts: 10,077
Joined: 22-March 03
From: USofA
Member No.: 453
Region Association: Pacific Northwest
Im with Chris! Check the CHT!!! I just went through this with my car and the fix was the pot & resistor trick. Now it runs like a champ.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Brad Roberts
post May 29 2003, 01:25 PM
Post #7


914 Freak!
***************

Group: Members
Posts: 19,148
Joined: 23-December 02
Member No.: 8
Region Association: None
It sucks. I have a car that is running like crap cold..but runs great when warmed up (wifes car) The CHT measures within spec.

Anybody have the factory resistor they can sell me ??

B
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
ChrisReale
post May 29 2003, 01:27 PM
Post #8


Sleazy
****

Group: Members
Posts: 2,665
Joined: 20-January 03
From: San Francisco
Member No.: 176
I have an extra CHT for a 73 2.0, if thats what you mean. I believe it is the ...017
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Brad Roberts
post May 29 2003, 01:30 PM
Post #9


914 Freak!
***************

Group: Members
Posts: 19,148
Joined: 23-December 02
Member No.: 8
Region Association: None
Nope. The 73 2.0's had/have a 300ohm resister in line with the CHT. I need one. I could do the whole measurement thing, but her car is bone ass stock and runs like a Swiss Watch (except when cold) so.. a stock part would be better than me going to Radio Shack for resistors.


B
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
ThinAir
post May 29 2003, 02:02 PM
Post #10


Best friends
****

Group: Members
Posts: 2,542
Joined: 4-February 03
From: Flagstaff, AZ
Member No.: 231
Region Association: Southwest Region
Is it really as easy as a 300 ohm resister from Radio Shack? My 73 has the ECU that (according to PBAnders' D-Jet site) requires the resister inline with the CHT. I don't know which CHT I've got, but I know that it doesn't have a resister. Somehow I had the impression the a "ballast resister" was a little more complicated. My car seems to be running fine, but I'd like to know that it truly is "right".
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Brad Roberts
post May 29 2003, 02:09 PM
Post #11


914 Freak!
***************

Group: Members
Posts: 19,148
Joined: 23-December 02
Member No.: 8
Region Association: None
To get things "correct" you need to know which CHT you have. One of them needs to have the 300ohm resistor and the other "supposedly" doenst need one. Porsche lists 2 part numbers. One for 73 2.0 and one for 74-76 2.0


B
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
ChrisReale
post May 29 2003, 03:41 PM
Post #12


Sleazy
****

Group: Members
Posts: 2,665
Joined: 20-January 03
From: San Francisco
Member No.: 176
Actually, it a 270 ohm resistor. Go to radio shack and get a resistor for $1, shrink wrap it and your are good to go. Of course, I spent $30 on the factory Wehrle resistor (IMG:style_emoticons/default/hanged.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Brad Roberts
post May 29 2003, 04:13 PM
Post #13


914 Freak!
***************

Group: Members
Posts: 19,148
Joined: 23-December 02
Member No.: 8
Region Association: None
I swear.. I dont know where I got 300. I told Mueller last night I thought it was 300 or 350. Maybe I'm thinking of actual head temps (300-350)

B
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
ThinAir
post May 29 2003, 04:18 PM
Post #14


Best friends
****

Group: Members
Posts: 2,542
Joined: 4-February 03
From: Flagstaff, AZ
Member No.: 231
Region Association: Southwest Region
Is there a readable part # on the HTC so you can tell which one you have once you've removed it from the package?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
ChrisReale
post May 29 2003, 06:31 PM
Post #15


Sleazy
****

Group: Members
Posts: 2,665
Joined: 20-January 03
From: San Francisco
Member No.: 176
Ernie,
The CHT you want has the last 3 digits of 017.You can kinda peek your head in theengine compartment and see the numbers, if your rubber gromet for the CHT is missing. Otherwise you need to take the CHT out to see. That is for the 1973 2.0L D-jet. You also want the Werhle (spelling might not be right) 270 ohm resistor. A radio shack one works fine, but you need to protect it with shrink wrap or something. I just bought the Werhle because I didnt want to mess with it.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
ChrisReale
post May 29 2003, 06:31 PM
Post #16


Sleazy
****

Group: Members
Posts: 2,665
Joined: 20-January 03
From: San Francisco
Member No.: 176
QUOTE(ErnieDV @ May 29 2003, 03:18 PM)
Is there a readable part # on the HTC so you can tell which one you have once you've removed it from the package?

To answer your question, yes, the part number is on the CHT.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Joe Bob
post May 29 2003, 07:02 PM
Post #17


Retired admin, banned a few times
***************

Group: Members
Posts: 17,427
Joined: 24-December 02
From: Boulder CO
Member No.: 5
Region Association: None
I got a few of the resistors from RadioCrap.....a 200 and a 100 and then a bunch of 20s.....kept adding until it was where I wanted it....
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
ne14914
post May 29 2003, 09:36 PM
Post #18


Me N My914
**

Group: Members
Posts: 94
Joined: 4-March 03
From: Los Angeles, Cali (Inland Empire)
Member No.: 388
so this pretty much sums it up huh-

the cylinder head temperature. I will go to Pelican tomorrow and pick one up.

Thanks.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Aaron Cox
post May 29 2003, 09:41 PM
Post #19


Professional Lawn Dart
***************

Group: Retired Admin
Posts: 24,541
Joined: 1-February 03
From: OC
Member No.: 219
Region Association: Southern California
hey NE14914,
are you going to the pomona swap this sun? (IMG:style_emoticons/default/cool_shades.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
914werke
post May 29 2003, 10:23 PM
Post #20


"I got blisters on me fingers"
**********

Group: Members
Posts: 10,077
Joined: 22-March 03
From: USofA
Member No.: 453
Region Association: Pacific Northwest
Mike that is why for the potentiometer! Once installed you can *dial* it in.

(IMG:style_emoticons/default/rolleyes.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

2 Pages V  1 2 >
Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Switch to: Standard · Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 20th May 2024 - 03:28 AM
Invision Power Board v9.1.4 © 2024  IPS, Inc.
All rights reserved 914World.com © since 2002
914World.com is the fastest growing online 914 community!
We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ...