Search found 334 matches

by Fat Freddy
Thu Aug 18, 2022 1:22 am
Forum: Diagnostic discussion
Topic: 1995 Toyota 4runner hard starting when cold
Replies: 1
Views: 62

Re: 1995 Toyota 4runner hard starting when cold

I'll assume 'cold' means sitting a while?

Have you checked for air bleeding into fuel line (clamps, split/hard hose, etc) allowing fuel to drain back to tank? Common as hell
by Fat Freddy
Wed Mar 16, 2022 3:39 am
Forum: Diagnostic discussion
Topic: In cylinder, timing variation per cylinder
Replies: 6
Views: 3759

Re: In cylinder, timing variation per cylinder

IMO your cranking speed is way to low (from sitting parked up or because of endless cranking :?: :?: :?: :?: ). But that would defo exacerbate the problem as more time for the cylinder to leak down. Again, IMO, I wouldn't expect a cylinder to fire with less than 100psi during cranking, although at i...
by Fat Freddy
Sat Jan 15, 2022 7:17 am
Forum: Diagnostic discussion
Topic: In cylinder, timing variation per cylinder
Replies: 6
Views: 3759

Re: In cylinder, timing variation per cylinder

Also may explain the high compression on a well sealed cylinder due to the longer duration the inlet valve is open for, allowing the cylinder to 'fill' more efficiently...........Possibly
by Fat Freddy
Sat Jan 15, 2022 6:49 am
Forum: Diagnostic discussion
Topic: In cylinder, timing variation per cylinder
Replies: 6
Views: 3759

Re: In cylinder, timing variation per cylinder

TDC can not be taken from compression peaks on a leaky cylinder as the cylinder starts to lose compression faster than the piston can generate it due to a slowing piston speed as it approaches true TDC there fore advancing the compression peak. In the image below I have aligned all three cylinders u...
by Fat Freddy
Fri Jan 01, 2021 9:46 am
Forum: Case studies
Topic: Zafira A z18xe misfire
Replies: 9
Views: 15550

Re: Zafira A z18xe misfire

Is this repaired? Went down this road about nine years ago with same engine. https://www.autonerdz.com/cgi/yabb2/YaBB.pl?num=1333103032/0 I repaired the damage but still had a problem that only disappeared with another (the 3rd) ecu, since then I've been unsure how many faults I was dealing with. On...
by Fat Freddy
Thu Sep 03, 2020 12:12 pm
Forum: Help me fix my car
Topic: First look sensor signal delay
Replies: 9
Views: 7135

Re: First look sensor signal delay

In my case, a longer hose changes the time delay significantly, Would you have any data files to show that? If not, you've given me an excellent idea. Does anybody have the chance to do similar measurements with a pico WPS or first look sensor to proof my theory? Yes, I have. It's on here somewhere...
by Fat Freddy
Wed Aug 19, 2020 10:23 am
Forum: Help me fix my car
Topic: Help me fix some ones boat.
Replies: 3
Views: 4314

Re: Help me fix some ones boat.

Fixed: (at the mo). Pressure reg fixed the pressure problem. New ECU fixed comms. He's rapped, taking it out to kill some stuff.
by Fat Freddy
Mon Aug 17, 2020 2:12 pm
Forum: Diagnostic discussion
Topic: Piezo injector operation. Current vs voltage
Replies: 41
Views: 32057

Re: Piezo injector operation. Current vs voltage

My comment is in reference to this statement.
So when my fluke shows me 12V or -12V, it does not show me voltage direction (a bit improper word).
No voltage direction. It's relative potential difference. Just like the linesmen doing his job safely.
by Fat Freddy
Mon Aug 17, 2020 2:03 pm
Forum: Diagnostic discussion
Topic: Piezo injector operation. Current vs voltage
Replies: 41
Views: 32057

Re: Piezo injector operation. Current vs voltage

Absolutely not comparing onions with strawberries. Trying to give you a visual example. You have completely missed the point. He is not Grounded to Earth. Point being? Nothing Piezo there, Is there ? Nope! Wasn't talking Piezo. Talking what a voltage measurement meant. He has no Scope or any real Me...
by Fat Freddy
Sun Aug 16, 2020 4:00 am
Forum: Diagnostic discussion
Topic: Piezo injector operation. Current vs voltage
Replies: 41
Views: 32057

Re: Piezo injector operation. Current vs voltage

Some people don't see it this way, but voltage is just present, the voltage levels change but voltage is always there, it has no direction. Agree. It's a relative thing. It's a measure of potential difference. It's why bleed down resistors exist. https://youtu.be/9YmFHAFYwmY?t=64 In this video you ...