 Stumble at aroud 5K RPM, 75 2.0L D-JET |
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| solex |
  Jun 8 2010, 06:30 PM
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#1
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Senior Member  Group: Members Posts: 789 Joined: 12-January 05 From: Long Island, NY Member No.: 3,439 Region Association: North East States  |
Hi,
All I just completed with the help from some people on the forum a debug of my fuel and ignition system. Turned out I need a new fuel pump, I got Bosch pump from PP and have been driving it since. I did a mini-tune up last night adjusted the dwell and timing. The car as a new air, fuel filter, plugs, Magnacore wires, cap and rotor but noticed that around 5K RPM the car stumbles. Where should I look next. Thanks, Dan |
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| bfrymire |
Jun 8 2010, 07:15 PM
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#2
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Salsaholic Group: Members Posts: 590 Joined: 1-August 04 From: Sunnyvale, CA Member No.: 2,431 Region Association: Northern California |
When this happened to me, it was the MAP sensor (or whatever it was called, it's been a while since i messed with D_Jet.)
-- brett QUOTE(solex @ Jun 8 2010, 05:30 PM)  Hi, All I just completed with the help from some people on the forum a debug of my fuel and ignition system. Turned out I need a new fuel pump, I got Bosch pump from PP and have been driving it since. I did a mini-tune up last night adjusted the dwell and timing. The car as a new air, fuel filter, plugs, Magnacore wires, cap and rotor but noticed that around 5K RPM the car stumbles. Where should I look next. Thanks, Dan |
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| Tom |
Jun 13 2010, 02:01 PM
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#3
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Advanced Member Group: Members Posts: 2,139 Joined: 21-August 05 From: Port Orchard, WA 98367 Member No.: 4,626 Region Association: None |
Points! Weak spring causing point "bounce".
Tom |
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| underthetire |
Jun 13 2010, 02:09 PM
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#4
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914 Guru Group: Members Posts: 5,062 Joined: 7-October 08 From: Brentwood Member No.: 9,623 Region Association: Northern California |
QUOTE(Tom @ Jun 13 2010, 01:01 PM) Points! Weak spring causing point "bounce". Tom (IMG:style_emoticons/default/agree.gif) Or stuck mechanical advance. Switch to electronics and be done with the "mini" tuneups. |
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| ConeDodger |
Jun 13 2010, 02:39 PM
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#5
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Apex killer! Group: Members Posts: 24,089 Joined: 31-December 04 From: Tahoe Area Member No.: 3,380 Region Association: Northern California 
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You are just about at redline for the stock engine. Do you have the rev limiting rotor on there?
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| jimtab |
Jun 13 2010, 03:06 PM
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#6
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Advanced Member Group: Members Posts: 3,477 Joined: 5-January 03 From: Pacifica, California Member No.: 91 Region Association: Northern California |
might have "rev limiting" on the dizzy......pertronics?
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| solex |
Jun 13 2010, 07:34 PM
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#7
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Senior Member Group: Members Posts: 789 Joined: 12-January 05 From: Long Island, NY Member No.: 3,439 Region Association: North East States |
No rev limiter, I believe that the coil may be on its last legs. This is one of the last things in the ignition system that I have not replaced, it is not an original Bosch blue and the last time I checked it was not putting out a healthy spark.
I just ordered a Bosch blue from PP and will report back, I think this may also fix the erratic tach. problem I have |
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| underthetire |
Jun 13 2010, 07:39 PM
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#8
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914 Guru Group: Members Posts: 5,062 Joined: 7-October 08 From: Brentwood Member No.: 9,623 Region Association: Northern California |
Might wanna order the compu-fire or pertronix to. Mine has a built in rev limiter- its called hydraulic lifters. (IMG:style_emoticons/default/biggrin.gif)
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| JamesM |
Jun 13 2010, 09:10 PM
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#9
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Advanced Member Group: Members Posts: 2,094 Joined: 6-April 06 From: Kearns, UT Member No.: 5,834 Region Association: Intermountain Region |
lol mine too, refuses to rev past 5k. I had my motor built with them 10 years ago when i was only using it as a daily driver. Thought it was a good idea for the first 7 years, then i started autox'ing (IMG:style_emoticons/default/headbang.gif) (IMG:style_emoticons/default/headbang.gif) (IMG:style_emoticons/default/headbang.gif) Now i am doing everything I can to break something just so i have an excuse to swap back to solids. I am starting to be convinced that this engine is actually bulletproof though. 10 years of abuse and it still won't even go so far as to leak a drop of oil on the garage floor. I am cursed with a 914 that wont break!
QUOTE(underthetire @ Jun 13 2010, 05:39 PM) Might wanna order the compu-fire or pertronix to. Mine has a built in rev limiter- its called hydraulic lifters. (IMG:style_emoticons/default/biggrin.gif) |
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