Pennock's Fiero Forum
  Technical Discussion & Questions
  Fuel pump and throttle body problems

Post New Topic  Post A Reply
Email This Page to Someone! | Printable Version


next newest topic | next oldest topic
Fuel pump and throttle body problems by jaredaltizer
Started on: 06-08-2019 11:30 PM
Replies: 4 (177 views)
Last post by: jaredaltizer on 06-12-2019 01:17 PM
jaredaltizer
Member
Posts: 122
From: Tucson, AZ
Registered: Apr 2017


Feedback score: N/A
Leave feedback

Rate this member

Report this Post06-08-2019 11:30 PM Click Here to See the Profile for jaredaltizerSend a Private Message to jaredaltizerEdit/Delete MessageReply w/QuoteDirect Link to This Post
Hello PFFers.

Recently, I have taken on the task of swapping my stock 2.8 V6 out for a lower-mileage one, because I threw a rod in my original motor. This has been my first and (hopefully) only engine swap. After finally getting the engine and cradle back into the car with most of the vacuum lines and wiring harness hooked up, I have run into a couple problems.

My first problem is what I think is the fuel pump. The new engine will crank and turn over, but usually dies within a second or two. My buddy then told me to try starting the car again while he sprayed brake cleaner onto the throttle body, which seemed to work. He was able to keep it running as long as he sprayed the brake cleaner. I am assuming that this means I have a fuel-related issue. I can hear the fuel pump prime when I turn the key in the ignition, but I assume that it just won't stay pumping. Are there any suggestions on where to start looking for a fix? (Without the obvious answer of "buy a new fuel pump", as it was working with the old engine.)

My second problem is the throttle cable and attaching it to the throttle body. I cannot remember how the throttle cable (and cruise control cable) connect to the throttle body. Would anyone be able to help me out and post some pictures?
IP: Logged
PFF
System Bot
Patrick
Member
Posts: 36253
From: Vancouver, British Columbia, Canada
Registered: Apr 99


Feedback score: (1)
Leave feedback





Total ratings: 458
Rate this member

Report this Post06-09-2019 12:46 AM Click Here to See the Profile for PatrickSend a Private Message to PatrickEdit/Delete MessageReply w/QuoteDirect Link to This Post

Don't make guesses... check the fuel pressure!
IP: Logged
Dennis LaGrua
Member
Posts: 15140
From: Hillsborough, NJ U.S.A.
Registered: May 2000


Feedback score:    (13)
Leave feedback





Total ratings: 328
Rate this member

Report this Post06-10-2019 09:34 AM Click Here to See the Profile for Dennis LaGruaSend a Private Message to Dennis LaGruaEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Patrick:


Don't make guesses... check the fuel pressure!


Exactly. You can't solve problems in the blind! Place a gauge on the schrader fitting on the fuel rail and see what it reads. Somewhere in the neighborhood of 38-43 lbs at idle is where it should read. NO pressure = defective fuel pump. Low fuel pressure = bad FP regulator.

------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

IP: Logged
randy86
Member
Posts: 90
From: Vero Beach
Registered: May 2019


Feedback score: N/A
Leave feedback

Rate this member

Report this Post06-12-2019 01:14 PM Click Here to See the Profile for randy86Send a Private Message to randy86Edit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Dennis LaGrua:


Exactly. You can't solve problems in the blind! Place a gauge on the schrader fitting on the fuel rail and see what it reads. Somewhere in the neighborhood of 38-43 lbs at idle is where it should read. NO pressure = defective fuel pump. Low fuel pressure = bad FP regulator.



No pressure could also be bad injectors, because one or more is stuck open.
IP: Logged
jaredaltizer
Member
Posts: 122
From: Tucson, AZ
Registered: Apr 2017


Feedback score: N/A
Leave feedback

Rate this member

Report this Post06-12-2019 01:17 PM Click Here to See the Profile for jaredaltizerSend a Private Message to jaredaltizerEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by randy86:


No pressure could also be bad injectors, because one or more is stuck open.


I changed out the injectors yesterday, and they were my problem. 4 out of the 6 of the injectors had the caps broken off.
IP: Logged

next newest topic | next oldest topic

All times are ET (US)

Post New Topic  Post A Reply
Hop to:

Contact Us | Back To Main Page

Advertizing on PFF | Fiero Parts Vendors
PFF Merchandise | Fiero Gallery | Ogre's Cave
Real-Time Chat | Fiero Related Auctions on eBay



Copyright (c) 1999, C. Pennock