1.7ltr FI issue.....

Hutcho Wolfsburg Wizard

528 posts · joined Aug 2002 · 26 Aug 2008, 7:52 pm

#666114

Hey Guys,
Hoping someone could point me in the right direction.
I can start the car up in the morning and I idles great. I can drive it after that and it drives strong and powerful (as powerful as a FI 1.7ltr motor can be ;-) ) but it comes to a point after about 20 minutes of driving that the motor stutters a bit then goes fine again but wont idle??? As long as the car is driving, it goes great but it just wont idle.....
Im starting to think it may be a vacuum or compression problem???
Can anyone help?

Thanks,
Steve

PurpleT3 Fahrvergnugen

880 posts · joined Apr 2003 · 26 Aug 2008, 9:20 pm

#666152

Is it a type 3 or type 4 FI motor? Is the FI stock or aftermarket?

Either way it sounds like it might be related to the idle circuit or cold start enrichment not functioning properly. Engine cold - all OK, engine hot - revs ok, idle crap.

I'm thinking that compression problem would make it crap all the time.

Ain't nothin' like the wind in your hair.

vw54 Administrator Always Waiting 4 Friday

16,723 posts · joined Aug 2002 · 27 Aug 2008, 7:01 am

#666203

yes compression would make it crap all the time
its in one of the sensors possible head temp and after 20 mins its warm and may be open circuit

I read it on FACEBOOK so it must be true

http://forums.aussieveedubbers.com/viewtopic.php?tid=91278&page=1#pid848630

http://forums.aussieveedubbers.com/viewtopic.php?tid=63561&page=1#pid624099

http://forums.aussieveedubbers.com/viewtopic.php?tid=4832&page=1#pid452603

http://forums.aussieveedubbers.com/viewtopic.php?tid=60650&page=1#pid574409

Hutcho Wolfsburg Wizard

528 posts · joined Aug 2002 · 27 Aug 2008, 7:36 pm

#666292

Thanks, guys.
Its a Type 4 motor , original 1.7ltr D-Jet Injection. Yeah, sounds right with the compression.
Ill check the CHT (cylinder head sensor) tomorow. From recent research, its supposed to be 2k ohm cold and around 200 ohm hot...
A guy had the exact symptoms Im having (on a different flat four) and he let me know that he replaced the MPS (Manifold Pressure Sensor) and all was good. Thats concerning cause its apparently a new one in my car. Will let you know!🤓
Hutcho

Hutcho Wolfsburg Wizard

528 posts · joined Aug 2002 · 14 Sep 2008, 6:30 pm

#669389

Ok, Cylinder head temp sensor is good. MPS is good. (holds a vacuum). Ive bypassed the Cold Start Valve/Injector (which is located in the Throttle body) on suspicion it may be leaking so its flooding the car and stalling it.
Another symptom is when it wont idle ie hot, I can hold the accelerator flat to the floor and it barely revs until about 10 or so seconds later. It really feels like its flooding for some reason..
If anyone has any ideas Id love to hear them otherwise its off to the Mechanics..... I hate not solving these kind of problems...
Steve

greedy53 Bishop of Volkswagenism

3,062 posts · joined Mar 2006 · 15 Sep 2008, 5:19 pm

#669580

that could be why most folks change over to carbys the injection in a bugger when old

👍👍😂🙅🥷😬🤓

Hutcho Wolfsburg Wizard

528 posts · joined Aug 2002 · 16 Sep 2008, 7:00 pm

#669805

greedy53 wrote:that could be why most folks change over to carbys the injection in a bugger when old

Thats cheating!😂
914's dont run too great on carbs anyway...

grumble Son of Jim - Creator of Good

2,672 posts · joined Jun 2008 · 16 Sep 2008, 10:25 pm

#669858

After spending untold hours testing swapping & buying head temp sensors,air flow meters,exchange computers etc I have to agree with greedy53 a good pair of rebuilt stock carbies & factory fittings & she'll run like new with a lot less heartache. I persevered because I thought it's a basic system & can't be much wrong but in the end I bit the bullet & I have a happy customer.

Hutcho Wolfsburg Wizard

528 posts · joined Aug 2002 · 17 Sep 2008, 6:57 am

#669888

grumble wrote:After spending untold hours testing swapping & buying head temp sensors,air flow meters,exchange computers etc I have to agree with greedy53 a good pair of rebuilt stock carbies & factory fittings & she'll run like new with a lot less heartache. I persevered because I thought it's a basic system & can't be much wrong but in the end I bit the bullet & I have a happy customer.

Fair enough... not what I really wated to hear though 🤪
Dont still have any of that efi gear do you?
Steve