Car seems to run fine only when slightly.

JEREMYCARLSON

MEMBER
1995 MAZDA 626
194,000 MILES

Car seems to run fine only when slightly pressing the accelerator peddle (10% throttle or so). However when pressing it down further, starts losing spark in all cylinders and sputters. Shop thinks it's a distributor problem, already ruled out ECU (replaced, same problem).

Distributor or possibly a throttle position sensor of some kind?

5 Replies

HMAC300

MECHANIC
48,601 POSTS

Scan for codes and check fuel pressure first. Clean grounds on left front and side of engine as well. It migh tnot be making good contact. Easier to do before distributor replacement.

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Monday, December 10th, 2012 AT 11:12 PM

JEREMYCARLSON

MEMBER
3 POSTS

No check engine light is being thrown, would it still throw a code in that case?

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Monday, December 10th, 2012 AT 11:13 PM

HMAC300

MECHANIC
48,601 POSTS

Fuelpressure wont' throw a code and will cause engine to run lean feelling like your condition fuel pressure should be 30-37 psi at idle w/vacuum an d 38-46 w/o vacuum

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Monday, December 10th, 2012 AT 11:20 PM

JEREMYCARLSON

MEMBER
3 POSTS

Ok. Also when I press the throttle slightly it will rev all the way up to redline (while in neutral) if I let it. Only there is a very specific point that I reach on the throttle when the ignition cuts out.

I should restate, with a timing light connected it is clear that the ignition is cutting out with the throttle pressed further down. I don't believe it's a fuel issue.

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Monday, December 10th, 2012 AT 11:53 PM

HMAC300