Go Back   986 Forum - for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Performance and Technical chat

Reply
 
LinkBack Thread Tools Display Modes
Old 03-28-2020, 02:08 PM   #1
Registered User
 
Join Date: Mar 2020
Location: Texas
Posts: 3
New Boxster/Porsche Owner Need Help Please

Hello All,
I recently purchased a 1999 Porsche Boxster with 83K miles on it. It ran fine at first and seems to run fine intermittently. The car now has a pretty extreme hesitation and stall that will usually start after WOT. I just had it completely checked out by an experienced Porsche mechanic but of course it was behaving fine that day. It is not sending any engine codes. He smoke tested the engine and looked for any stored codes but found nothing. At first we assumed that maybe I had just gotten some old gas as not many stations are moving the high octane these days. I replaced the spark plugs today and changed the oil. The ignition coils appear to be in great shape and are not the original but Beru brand. To me the issue feels like some severe misfiring or fuel supply issue. Any ideas on things I should check next that would not throw a code?

nwooten is offline   Reply With Quote
Old 03-28-2020, 03:08 PM   #2
Porsche "Purist"
 
Paul's Avatar
 
Join Date: Aug 2003
Location: Wisconsin
Posts: 2,095
Garage
Welcome to the board.

Fuel pressure?

Fuel pump relay?

Fuel pump?
__________________
1998 Boxster with 7.8 DME, 2005 3.6 liter/325 hp, Variocam Plus, 996 Instrument panel
2001 Boxster bought new. Installed used motor at 89k.
1987 924S. 2002 996TT. PST2
Owned and repaired Porsches since 1974. Have driven them all the way the Dr intended...
Paul is offline   Reply With Quote
Old 03-28-2020, 03:51 PM   #3
Registered User
 
Join Date: Aug 2017
Posts: 286
look at Brian Minson's U tube channel he just dealt with that...maybe yours is a filter.?
flmont is offline   Reply With Quote
Old 03-29-2020, 10:30 AM   #4
Registered User
 
Join Date: Mar 2020
Location: Texas
Posts: 3
Thank you guys! I went on a 20-30 mile drive yesterday and ran it to about 110 mph. I finally got a CEL and received P1128 and P1130. They of course disappeared again today and the car is running perfectly yet again. It seems to be an every other day type of malfunction at this point. I'm going to try to replace the MAF sensor and see if that clears it up. If not, next maybe the fuel pressure regulator. I'll post an update as to what resolves the issue, assuming I get it resolved, so that others struggling with the same issues can save some time, parts, frustration, etc.
nwooten is offline   Reply With Quote
Old 03-29-2020, 10:35 AM   #5
Registered User
 
Join Date: Mar 2020
Location: Texas
Posts: 3
Thank you guys! I drove it about 30 miles yesterday and ran it to about 110 mph. Finally got a CEL with codes P1128 and P1130. Of course the CEL is off today and it is running perfectly. It seems to be an every other day malfunction at this point. I'm going to order a new MAF sensor from Pelican's and see if that does in fact resolve the issue. If not, maybe the fuel pressure regulator? In any case, I will post the solution here for other members that may encounter the same issue.
nwooten is offline   Reply With Quote
Old 03-29-2020, 05:14 PM   #6
Artist, 986S tinkerer
 
NewArt's Avatar
 
Join Date: Aug 2013
Location: Montreal, Canada
Posts: 1,658
A vacuum leak is a likely suspect. Try inspecting vacuum lines and maybe spraying some starter fluid around connections in the intake system with the motor running. If you hear an increase in rpm, you’ve found your leak. Try the easy stuff before throwing parts at it!
__________________
James
2004 986 S
987 air intake TB and plenum, Mantissport 2 litre sump, UDP, Bilstein B6 with H&R lowering spings, re71-rs for track, other stuff.
https://www.youtube.com/user/12shoes2
NewArt is offline   Reply With Quote
Old 03-30-2020, 06:35 AM   #7
Registered User
 
BYprodriver's Avatar
 
Join Date: Oct 2008
Location: O.C. CA
Posts: 3,442
Garage
Could be fuel pump,or filter, pull some of those new spark plugs to see how they are burning. That's the easy way to see what's going on inside. I bet the trouble code was from running lean

__________________
Jerk that is constantly criticzing new forum members and overly advertising my rebuilt engine for sale for a highly inflating price along with other miscellaneous parts accumulated over my 20 years of ownership.
BYprodriver is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -8. The time now is 10:39 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page