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SC300Drifter

95 Misfire/hesitation While Accelerating

4 posts in this topic

My 1995 LS400 just started jumping under normal acceleration, it feels like its misfiring. This only happens when the car is at normal operating temperature and under light accel , the car runs fine when cold or 70%+ throttle. The check engine light has not come on so cant get a code.

The plugs and wires were changed about 20k ago, the only thing i can think of is I ran the car out of gas (coasted into the gas station) about 2 months ago but it hasnt shown any problems until today so im not sure if thats even related.

Any suggestions would be appreciated, the car is parked until I can figure out whats wrong because I dont want anything to get damaged any further.

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There's a problem with the air/fuel mix. This could be indeed related to the 'running out of gas'.

- clogged fuel filter (caused by debris from bottom tank)

- Dirty fuel injectors

- your MAF sensor is slightly off, caused by air impurities, still not enough (yet) to set off faultcodes.

- Sparks and wiring you checked, I assume these are OK.

Although I have not any experience myself re. cleaner additives, some book good results with them, so it might be a try. Perhaps other members can share their experience and thoughts re. cleaners and results.

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Thanks for the help, I will be replacing the fuel filter to see if that helps tomorrow. How do I check the maf?

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Have a look at this topic. More to the end there are some docs, to troubleshoot or clean a MAF. As I understand, the type of 'MAF' can be different for LS400's.

MAF info

If you're on it, check or clean the throttlebody too.

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