Problem starting, looking for suggestions

XR4Ti / Sierra / Sierra Cosworth Discussions - Questions, problem resolution, general talk, technical tips and modifications.
Post Reply
User avatar
smoke3006
Level 4
Level 4
Posts: 392
Joined: Mon Sep 19, 2005 8:48 am
Location: CT

Problem starting, looking for suggestions

Post by smoke3006 » Wed Jul 22, 2009 8:35 pm

Engine turns over fine, but the car doesn't fire until I step on the gas pedal.
This is an 85 with a PE and other changes.
I cleaned the IAC but that didn't help.

Anyone have any suggestions?
sam
'86 Regency Red Metallic XR4Ti -Blood Monkey

Cure your fever:
http://www.morecowbell.dj/

hEaT
Level 7
Level 7
Posts: 3842
Joined: Mon May 07, 2007 10:12 pm
Location: MA, USA

Post by hEaT » Wed Jul 22, 2009 8:43 pm

Does it stay running after it starts and your foot off the pedal?

If not, your throttle screw might just be backed out too far.
Joe
1985 Nimbus Grey XR
2017 Ford Focus RS

User avatar
adamt85
Level 4
Level 4
Posts: 340
Joined: Tue Jun 24, 2008 4:11 pm
Location: Wenatchee,wa

Post by adamt85 » Thu Jul 23, 2009 4:57 am

I had that symptom, my injectors where clogged really really bad
89 5spd white xr4ti-wrecked
88 white cosified xr4ti

User avatar
Mike McCreight
Level 7
Level 7
Posts: 3979
Joined: Fri Oct 31, 2003 8:44 pm
Location: Ottawa! Well, Manotick, actually...

Post by Mike McCreight » Thu Jul 23, 2009 8:16 am

What voltage does your TPS read at closed throttle?
I think that's the best place to start.
It's not a hobby, it's an obsession!

User avatar
DPDISXR4Ti
Site Admin
Posts: 13345
Joined: Wed Jan 08, 2003 11:40 pm
Location: New York

Post by DPDISXR4Ti » Thu Jul 23, 2009 11:41 am

Got vacuum?
Brad

Ed Lijewski
Level 8
Posts: 7064
Joined: Thu Sep 04, 2003 5:53 pm
Location: The Belly of The Beast

Post by Ed Lijewski » Thu Jul 23, 2009 12:31 pm

POssible defective ECT (Engine Coolant Temperature) sensor signal to the ECU resulting in overly rich mixture? Leaky valve seals (oil leaks into the cylinders and temporariily fouls the plugs on start-up)?

YMMV 8)
Descartes: "Cogito Ergo Sum"
Lijewski: "Sum Ergo Drive-O. Mucho!

User avatar
Postal_DK
Level 2
Level 2
Posts: 119
Joined: Sat Jul 11, 2009 12:37 pm
Location: Denmark
Contact:

Post by Postal_DK » Thu Jul 23, 2009 1:11 pm

Ed Lijewski wrote:POssible defective ECT (Engine Coolant Temperature) sensor signal to the ECU resulting in overly rich mixture?
YMMV 8)
you have an overview of how many ohms such a sensor will be?

User avatar
smoke3006
Level 4
Level 4
Posts: 392
Joined: Mon Sep 19, 2005 8:48 am
Location: CT

Post by smoke3006 » Thu Jul 23, 2009 4:54 pm

Once it starts it runs ok, not great but ok.

I'll check the TPS.

Anyone thing I can use to clean the injectors safely?
sam
'86 Regency Red Metallic XR4Ti -Blood Monkey

Cure your fever:
http://www.morecowbell.dj/

User avatar
Ray
Level 7
Level 7
Posts: 4332
Joined: Sun Oct 24, 2004 10:40 am
Location: CT, USA

Post by Ray » Mon Jul 27, 2009 7:06 am

Sam we can try and troubleshoot this later this week if you want -

Given the fact that your car is also down on power, and not making as much boost, it could be one of several things. We'll start with the easiest and cheapest first (vacuum) then go onto the rest (ECT, injectors, etc)

I dont think it's valve seals, ed - the car doesn't blow any oil smoke at all.
-Ray
1985 Ford F150 - Tow Missile
1985 Merkur XR4Ti -#141 CP "Miss Daisy"
2005 Subaru LGT
http://www.cartct.com

Post Reply